Compile bug: UI: HF download failed

[sjmik]

Git commit

ebc1077

Operating systems

Linux

GGML backends

CPU

Problem description & steps to reproduce

Server UI download from huggingface fails. The files are reachable over the network from the building machine.

Full unredacted output

ubuntu@vm0:/opt$ podman build --format docker --target build -t llama.cpp:server-build -f llama-cpp/serverj1.Dockerfile llama-cpp/llama.cpp
STEP 1/7: FROM ubuntu:24.04 AS build
STEP 2/7: RUN apt-get update &&     apt-get install -y gcc-14 g++-14 build-essential git cmake ccache
--> Using cache 6458ae95f0b62e2aad011b8d2f78b2f3d6ee9923360bbad11845e55d1786841f
--> 6458ae95f0b6
STEP 3/7: ENV CC="ccache gcc-14" CXX="ccache g++-14"
--> Using cache dbd3a66e1da59ffb4a2da3d6d0beb1429d5495fc6390833cbcaf324ec5d65ea2
--> dbd3a66e1da5
STEP 4/7: WORKDIR /app
--> Using cache 76d87ff38aafd0dec2c0184dab8b2d391354844626c5fb6ac1216ea4936d6fd4
--> 76d87ff38aaf
STEP 5/7: COPY . .
--> Using cache e7f0be1791f45ad6f4a53dc99e65d9d58f4c9fd6be41dd15191718fda7a187ec
--> e7f0be1791f4
STEP 6/7: RUN --mount=type=cache,target=/root/.cache/ccache   cmake -S . -B build -DCMAKE_BUILD_TYPE=Release   -DGGML_NATIVE=ON   -DGGML_LTO=ON   -DLLAMA_BUILD_COMMON=ON   -DLLAMA_BUILD_TESTS=OFF   -DLLAMA_BUILD_TOOLS=ON   -DLLAMA_BUILD_EXAMPLES=OFF   -DLLAMA_BUILD_SERVER=ON   -DLLAMA_BUILD_APP=OFF   -DLLAMA_BUILD_UI=ON   -DLLAMA_USE_PREBUILT_UI=ON   -DLLAMA_TOOLS_INSTALL=ON   -DLLAMA_TESTS_INSTALL=OFF   -DLLAMA_OPENSSL=OFF   -DLLAMA_LLGUIDANCE=OFF     && cmake --build build --target llama-server -j 1
-- The C compiler identification is GNU 14.2.0
-- The CXX compiler identification is GNU 14.2.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/ccache - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/ccache - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
CMAKE_BUILD_TYPE=Release
-- Found Git: /usr/bin/git (found version "2.43.0")
-- The ASM compiler identification is unknown
-- Found assembler: /usr/bin/ccache
-- Warning: Did not find file Compiler/-ASM
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Success
-- Found Threads: TRUE
-- ccache found, compilation results will be cached. Disable with GGML_CCACHE=OFF.
-- CMAKE_SYSTEM_PROCESSOR: aarch64
-- GGML_SYSTEM_ARCH: ARM
-- Found OpenMP_C: -fopenmp (found version "4.5")
-- Found OpenMP_CXX: -fopenmp (found version "4.5")
-- Found OpenMP: TRUE (found version "4.5")
-- Including CPU backend
-- ARM detected
-- Performing Test GGML_COMPILER_SUPPORTS_FP16_FORMAT_I3E
-- Performing Test GGML_COMPILER_SUPPORTS_FP16_FORMAT_I3E - Failed
CMake Warning at ggml/src/ggml-cpu/CMakeLists.txt:138 (message):
  ARM -march/-mcpu not found, -mcpu=native will be used
Call Stack (most recent call first):
  ggml/src/CMakeLists.txt:463 (ggml_add_cpu_backend_variant_impl)


-- Performing Test GGML_MACHINE_SUPPORTS_dotprod
-- Performing Test GGML_MACHINE_SUPPORTS_dotprod - Failed
-- Performing Test GGML_MACHINE_SUPPORTS_nodotprod
-- Performing Test GGML_MACHINE_SUPPORTS_nodotprod - Failed
-- Performing Test GGML_MACHINE_SUPPORTS_i8mm
-- Performing Test GGML_MACHINE_SUPPORTS_i8mm - Failed
-- Performing Test GGML_MACHINE_SUPPORTS_noi8mm
-- Performing Test GGML_MACHINE_SUPPORTS_noi8mm - Failed
-- Performing Test GGML_MACHINE_SUPPORTS_sve
-- Performing Test GGML_MACHINE_SUPPORTS_sve - Failed
-- Performing Test GGML_MACHINE_SUPPORTS_nosve
-- Performing Test GGML_MACHINE_SUPPORTS_nosve - Failed
-- Performing Test GGML_MACHINE_SUPPORTS_sme
-- Performing Test GGML_MACHINE_SUPPORTS_sme - Failed
-- Performing Test GGML_MACHINE_SUPPORTS_nosme
-- Performing Test GGML_MACHINE_SUPPORTS_nosme - Failed
-- Checking for ARM features using flags:
--   -mcpu=native
-- Performing Test HAVE_DOTPROD
-- Performing Test HAVE_DOTPROD - Success
-- Performing Test HAVE_SVE
-- Performing Test HAVE_SVE - Failed
-- Performing Test HAVE_MATMUL_INT8
-- Performing Test HAVE_MATMUL_INT8 - Failed
-- Performing Test HAVE_FMA
-- Performing Test HAVE_FMA - Success
-- Performing Test HAVE_FP16_VECTOR_ARITHMETIC
-- Performing Test HAVE_FP16_VECTOR_ARITHMETIC - Success
-- Performing Test HAVE_SME
-- Performing Test HAVE_SME - Failed
-- Adding CPU backend variant ggml-cpu: -mcpu=native
-- ggml version: 0.15.1
-- ggml commit:  ebc1077-dirty
-- Configuring done (2.4s)
-- Generating done (0.1s)
-- Build files have been written to: /app/build
[  0%] Building C object ggml/src/CMakeFiles/ggml-base.dir/ggml.c.o
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[  3%] Building CXX object ggml/src/CMakeFiles/ggml-base.dir/gguf.cpp.o
[  3%] Linking CXX shared library ../../bin/libggml-base.so
[  3%] Built target ggml-base
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[  3%] Building CXX object ggml/src/CMakeFiles/ggml-cpu.dir/ggml-cpu/ggml-cpu.cpp.o
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[ 70%] Building CXX object tools/mtmd/CMakeFiles/mtmd.dir/models/gemma4v.cpp.o
[ 71%] Building CXX object tools/mtmd/CMakeFiles/mtmd.dir/models/gemma4ua.cpp.o
[ 71%] Building CXX object tools/mtmd/CMakeFiles/mtmd.dir/models/gemma4uv.cpp.o
[ 71%] Building CXX object tools/mtmd/CMakeFiles/mtmd.dir/models/glm4v.cpp.o
[ 71%] Building CXX object tools/mtmd/CMakeFiles/mtmd.dir/models/granite-speech.cpp.o
[ 72%] Building CXX object tools/mtmd/CMakeFiles/mtmd.dir/models/granite4-vision.cpp.o
[ 72%] Building CXX object tools/mtmd/CMakeFiles/mtmd.dir/models/hunyuanvl.cpp.o
[ 72%] Building CXX object tools/mtmd/CMakeFiles/mtmd.dir/models/internvl.cpp.o
[ 73%] Building CXX object tools/mtmd/CMakeFiles/mtmd.dir/models/kimivl.cpp.o
[ 73%] Building CXX object tools/mtmd/CMakeFiles/mtmd.dir/models/kimik25.cpp.o
[ 73%] Building CXX object tools/mtmd/CMakeFiles/mtmd.dir/models/nemotron-v2-vl.cpp.o
[ 75%] Building CXX object tools/mtmd/CMakeFiles/mtmd.dir/models/llama4.cpp.o
[ 75%] Building CXX object tools/mtmd/CMakeFiles/mtmd.dir/models/llava.cpp.o
[ 75%] Building CXX object tools/mtmd/CMakeFiles/mtmd.dir/models/minicpmv.cpp.o
[ 75%] Building CXX object tools/mtmd/CMakeFiles/mtmd.dir/models/paddleocr.cpp.o
[ 76%] Building CXX object tools/mtmd/CMakeFiles/mtmd.dir/models/pixtral.cpp.o
[ 76%] Building CXX object tools/mtmd/CMakeFiles/mtmd.dir/models/qwen2vl.cpp.o
[ 76%] Building CXX object tools/mtmd/CMakeFiles/mtmd.dir/models/qwen3vl.cpp.o
[ 77%] Building CXX object tools/mtmd/CMakeFiles/mtmd.dir/models/mimovl.cpp.o
[ 77%] Building CXX object tools/mtmd/CMakeFiles/mtmd.dir/models/qwen3a.cpp.o
[ 77%] Building CXX object tools/mtmd/CMakeFiles/mtmd.dir/models/step3vl.cpp.o
[ 77%] Building CXX object tools/mtmd/CMakeFiles/mtmd.dir/models/siglip.cpp.o
[ 78%] Building CXX object tools/mtmd/CMakeFiles/mtmd.dir/models/whisper-enc.cpp.o
[ 78%] Building CXX object tools/mtmd/CMakeFiles/mtmd.dir/models/deepseekocr.cpp.o
[ 78%] Building CXX object tools/mtmd/CMakeFiles/mtmd.dir/models/deepseekocr2.cpp.o
[ 79%] Building CXX object tools/mtmd/CMakeFiles/mtmd.dir/models/mobilenetv5.cpp.o
[ 79%] Building CXX object tools/mtmd/CMakeFiles/mtmd.dir/models/youtuvl.cpp.o
[ 79%] Building CXX object tools/mtmd/CMakeFiles/mtmd.dir/models/yasa2.cpp.o
[ 79%] Linking CXX shared library ../../bin/libmtmd.so
[ 79%] Built target mtmd
[ 79%] Building CXX object common/CMakeFiles/llama-common-base.dir/build-info.cpp.o
[ 80%] Linking CXX static library libllama-common-base.a
[ 80%] Built target llama-common-base
[ 80%] Building CXX object vendor/cpp-httplib/CMakeFiles/cpp-httplib.dir/httplib.cpp.o
[ 80%] Linking CXX static library libcpp-httplib.a
[ 80%] Built target cpp-httplib
[ 80%] Building CXX object common/CMakeFiles/llama-common.dir/arg.cpp.o
[ 82%] Building CXX object common/CMakeFiles/llama-common.dir/chat-auto-parser-generator.cpp.o
[ 82%] Building CXX object common/CMakeFiles/llama-common.dir/chat-auto-parser-helpers.cpp.o
[ 82%] Building CXX object common/CMakeFiles/llama-common.dir/chat-diff-analyzer.cpp.o
[ 83%] Building CXX object common/CMakeFiles/llama-common.dir/chat-peg-parser.cpp.o
[ 83%] Building CXX object common/CMakeFiles/llama-common.dir/chat.cpp.o
[ 83%] Building CXX object common/CMakeFiles/llama-common.dir/common.cpp.o
[ 83%] Building CXX object common/CMakeFiles/llama-common.dir/console.cpp.o
[ 84%] Building CXX object common/CMakeFiles/llama-common.dir/debug.cpp.o
[ 84%] Building CXX object common/CMakeFiles/llama-common.dir/download.cpp.o
[ 84%] Building CXX object common/CMakeFiles/llama-common.dir/fit.cpp.o
[ 85%] Building CXX object common/CMakeFiles/llama-common.dir/hf-cache.cpp.o
[ 85%] Building CXX object common/CMakeFiles/llama-common.dir/imatrix-loader.cpp.o
[ 85%] Building CXX object common/CMakeFiles/llama-common.dir/json-partial.cpp.o
[ 85%] Building CXX object common/CMakeFiles/llama-common.dir/json-schema-to-grammar.cpp.o
[ 86%] Building CXX object common/CMakeFiles/llama-common.dir/llguidance.cpp.o
[ 86%] Building CXX object common/CMakeFiles/llama-common.dir/log.cpp.o
[ 86%] Building CXX object common/CMakeFiles/llama-common.dir/ngram-cache.cpp.o
[ 88%] Building CXX object common/CMakeFiles/llama-common.dir/ngram-map.cpp.o
[ 88%] Building CXX object common/CMakeFiles/llama-common.dir/ngram-mod.cpp.o
[ 88%] Building CXX object common/CMakeFiles/llama-common.dir/peg-parser.cpp.o
[ 88%] Building CXX object common/CMakeFiles/llama-common.dir/preset.cpp.o
[ 89%] Building CXX object common/CMakeFiles/llama-common.dir/regex-partial.cpp.o
[ 89%] Building CXX object common/CMakeFiles/llama-common.dir/reasoning-budget.cpp.o
[ 89%] Building CXX object common/CMakeFiles/llama-common.dir/sampling.cpp.o
[ 90%] Building CXX object common/CMakeFiles/llama-common.dir/speculative.cpp.o
[ 90%] Building CXX object common/CMakeFiles/llama-common.dir/unicode.cpp.o
[ 90%] Building CXX object common/CMakeFiles/llama-common.dir/jinja/lexer.cpp.o
[ 91%] Building CXX object common/CMakeFiles/llama-common.dir/jinja/parser.cpp.o
[ 91%] Building CXX object common/CMakeFiles/llama-common.dir/jinja/runtime.cpp.o
[ 91%] Building CXX object common/CMakeFiles/llama-common.dir/jinja/value.cpp.o
[ 91%] Building CXX object common/CMakeFiles/llama-common.dir/jinja/string.cpp.o
[ 92%] Building CXX object common/CMakeFiles/llama-common.dir/jinja/caps.cpp.o
[ 92%] Linking CXX shared library ../bin/libllama-common.so
[ 92%] Built target llama-common
[ 92%] Building CXX object tools/ui/CMakeFiles/llama-ui-embed.dir/embed.cpp.o
[ 92%] Linking CXX executable llama-ui-embed
[ 92%] Built target llama-ui-embed
[ 94%] Provisioning UI assets
-- UI: npm not found, skipping npm build
-- UI: downloading from b97: https://huggingface.co/buckets/ggml-org/llama-ui/resolve/b97
-- UI: download index.html from b97 failed: "HTTP response code said error"
-- UI: downloading from latest: https://huggingface.co/buckets/ggml-org/llama-ui/resolve/latest
-- UI: downloaded index.html
-- UI: downloaded loading.html
-- UI: download favicon.ico from latest failed: "HTTP response code said error"
-- UI: HF download failed
CMake Warning at /app/scripts/ui-assets.cmake:446 (message):
  UI: no assets available - building without an embedded UI.  In a
  disconnected environment, download the pre-built UI from a llama.cpp
  release at https://github.com/ggml-org/llama.cpp/releases and extract to
  tools/ui/dist.


[ 94%] Built target llama-ui-assets
[ 94%] Building CXX object tools/ui/CMakeFiles/llama-ui.dir/ui.cpp.o
[ 94%] Linking CXX static library libllama-ui.a
[ 94%] Built target llama-ui
[ 95%] Building CXX object tools/server/CMakeFiles/server-context.dir/server-chat.cpp.o
[ 95%] Building CXX object tools/server/CMakeFiles/server-context.dir/server-task.cpp.o
[ 95%] Building CXX object tools/server/CMakeFiles/server-context.dir/server-queue.cpp.o
[ 96%] Building CXX object tools/server/CMakeFiles/server-context.dir/server-common.cpp.o
[ 96%] Building CXX object tools/server/CMakeFiles/server-context.dir/server-context.cpp.o
[ 96%] Building CXX object tools/server/CMakeFiles/server-context.dir/server-tools.cpp.o
[ 97%] Linking CXX static library libserver-context.a
[ 97%] Built target server-context
[ 97%] Building CXX object tools/server/CMakeFiles/llama-server-impl.dir/server.cpp.o
[ 97%] Building CXX object tools/server/CMakeFiles/llama-server-impl.dir/server-http.cpp.o
[ 98%] Building CXX object tools/server/CMakeFiles/llama-server-impl.dir/server-models.cpp.o
[ 98%] Linking CXX shared library ../../bin/libllama-server-impl.so
[ 98%] Built target llama-server-impl
[ 98%] Building CXX object tools/server/CMakeFiles/llama-server.dir/main.cpp.o
[100%] Linking CXX executable ../../bin/llama-server
[100%] Built target llama-server
--> a850a23f766e
STEP 7/7: RUN mkdir -p /app/lib &&     find build -name "*.so*" -exec cp -P {} /app/lib \;
COMMIT llama.cpp:server-build
--> c0f1e2630a35
Successfully tagged localhost/llama.cpp:server-build
c0f1e2630a35c114b978d5d5df2c36faba09d2db43dffa1a7277cfae3fd10632
ubuntu@vm0:/opt$ curl -IL https://huggingface.co/buckets/ggml-org/llama-ui/resolve/latest/bundle.js
HTTP/2 302
content-type: text/plain; charset=utf-8
content-length: 1051
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date: Fri, 12 Jun 2026 16:26:39 GMT
x-powered-by: huggingface-moon
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HTTP/2 200
content-type: application/javascript
accept-ranges: bytes
content-disposition: inline; filename*=UTF-8''bundle.js; filename="bundle.js";
etag: "c1007d9df12e06a60097af6f57e5125cc6e6c5452958c0b7096e88cf68585244"
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date: Fri, 12 Jun 2026 16:26:40 GMT
alt-svc: h3=":443";ma=60;

First Bad Commit

Unknown, but did not happen yesterday (2026-06-11)

Compile command

cmake -S . -B build -DCMAKE_BUILD_TYPE=Release \
  -DGGML_NATIVE=ON \
  -DGGML_LTO=ON \
  -DLLAMA_BUILD_COMMON=ON \
  -DLLAMA_BUILD_TESTS=OFF \
  -DLLAMA_BUILD_TOOLS=ON \
  -DLLAMA_BUILD_EXAMPLES=OFF \
  -DLLAMA_BUILD_SERVER=ON \
  -DLLAMA_BUILD_APP=OFF \
  -DLLAMA_BUILD_UI=ON \
  -DLLAMA_USE_PREBUILT_UI=ON \
  -DLLAMA_TOOLS_INSTALL=ON \
  -DLLAMA_TESTS_INSTALL=OFF \
  -DLLAMA_OPENSSL=OFF \
  -DLLAMA_LLGUIDANCE=OFF \
    && cmake --build build --target llama-server -j 1

Relevant log output

ubuntu@vm0:/opt$ podman build --format docker --target build -t llama.cpp:server-build -f llama-cpp/serverj1.Dockerfile llama-cpp/llama.cpp
...
[ 94%] Provisioning UI assets
-- UI: npm not found, skipping npm build
-- UI: downloading from b97: https://huggingface.co/buckets/ggml-org/llama-ui/resolve/b97
-- UI: download index.html from b97 failed: "HTTP response code said error"
-- UI: downloading from latest: https://huggingface.co/buckets/ggml-org/llama-ui/resolve/latest
-- UI: downloaded index.html
-- UI: downloaded loading.html
-- UI: download favicon.ico from latest failed: "HTTP response code said error"
-- UI: HF download failed
CMake Warning at /app/scripts/ui-assets.cmake:446 (message):
  UI: no assets available - building without an embedded UI.  In a
  disconnected environment, download the pre-built UI from a llama.cpp
  release at https://github.com/ggml-org/llama.cpp/releases and extract to
  tools/ui/dist.

[ 94%] Built target llama-ui-assets
[100%] Built target llama-server

ubuntu@vm0:/opt$ curl -IL https://huggingface.co/buckets/ggml-org/llama-ui/resolve/latest/bundle.js
HTTP/2 302
HTTP/2 200

[OtherCrashOverride]

I am seeing this, too. The issue as as stated in the log. There is no "favicon.ico" in "latest" at the time of this writing:
https://huggingface.co/buckets/ggml-org/llama-ui/tree/latest

Its probably due to the UI update #23871 and the build failing / no release.

[ddh0]

I am seeing this same (or very similar?) issue too, starting today:

[ 16%] Building CUDA object ggml/src/ggml-cuda/CMakeFiles/ggml-cuda.dir/template-instances/fattn-tile-instance-dkq128-dv128.cu.o
-- UI: npm install failed (1)
--   stderr: npm ERR! code EBADENGINE
npm ERR! engine Unsupported engine
npm ERR! engine Not compatible with your version of node/npm: @chromatic-com/storybook@5.0.0
npm ERR! notsup Not compatible with your version of node/npm: @chromatic-com/storybook@5.0.0
npm ERR! notsup Required: {"node":">=20.0.0","yarn":">=1.22.18"}
npm ERR! notsup Actual:   {"npm":"9.2.0"}

npm ERR! A complete log of this run can be found in:
npm ERR!     /home/.npm/_logs/2026-06-12T22_17_42_608Z-debug-0.log

CMake Warning at /home/llama.cpp/scripts/ui-assets.cmake:446 (message):
  UI: no assets available - building without an embedded UI.  In a
  disconnected environment, download the pre-built UI from a llama.cpp
  release at https://github.com/ggml-org/llama.cpp/releases and extract to
  tools/ui/dist.


[ 16%] Building CUDA object ggml/src/ggml-cuda/CMakeFiles/ggml-cuda.dir/template-instances/fattn-tile-instance-dkq192-dv128.cu.o

My compile command is:

rm -rf ./build; time (cmake -B ./build -DCMAKE_BUILD_TYPE=Release -DGGML_CUDA=1 -DCMAKE_CUDA_ARCHITECTURES="89" -DLLAMA_OPENSSL=1 -DGGML_CCACHE=1 && cmake --build ./build --config Release -j 16)

[CISC]

It's because release got broken. The release is fixed now, but build.json is missing. cc/ @allozaur

[jmejiaperez]

i am seeing the following

CMake Warning at /home/optimus/repos/llama.cpp/scripts/ui-assets.cmake:444 (message):
  UI: provisioning failed; embedding stale assets from
  /home/optimus/repos/llama.cpp/build/tools/ui/dist

[Yam9032]

This is what I am seeing:

[ 95%] Built target mtmd
-- UI: downloaded manifest.webmanifest
-- UI: downloaded sw.js
-- UI: downloaded _app/version.json
-- UI: download build.json from latest failed: "HTTP response code said error"
-- UI: HF download failed
CMake Warning at /root/llama.cpp/scripts/ui-assets.cmake:444 (message):
  UI: provisioning failed; embedding stale assets from
  /root/llama.cpp/build/tools/ui/dist
[ 95%] Built target llama-ui-assets
[ 95%] Building CXX object tools/ui/CMakeFiles/llama-ui.dir/ui.cpp.o
/root/llama.cpp/build/tools/ui/ui.cpp:245:28: error: zero-size array 'asset_60_data'
  245 | static const unsigned char asset_60_data[] = {};
      |                            ^~~~~~~~~~~~~
gmake[3]: *** [tools/ui/CMakeFiles/llama-ui.dir/build.make:76: tools/ui/CMakeFiles/llama-ui.dir/ui.cpp.o] Error 1
gmake[2]: *** [CMakeFiles/Makefile2:4865: tools/ui/CMakeFiles/llama-ui.dir/all] Error 2
gmake[2]: *** Waiting for unfinished jobs....
[ 95%] Linking CXX shared library ../bin/libllama-common.so
[ 95%] Built target llama-common
gmake[1]: *** [CMakeFiles/Makefile2:5047: tools/server/CMakeFiles/llama-server.dir/rule] Error 2
gmake: *** [Makefile:1843: llama-server] Error 2

[aldehir]

Please build from master, this should be resolved now. You may need to remove your build directory and rebuild from scratch.

[CISC]

You must regenerate your build directory or the bucket URL will get resolved incorrectly:

-- UI: downloading from latest: https://huggingface.co/buckets/llama-ui/resolve/latest/dist.tar.gz
-- UI: download dist.tar.gz from latest failed: "HTTP response code said error"
-- UI: HF download failed
CMake Warning at ./scripts/ui-assets.cmake:339 (message):
  UI: no assets available - building without an embedded UI.  In a
  disconnected environment, download the pre-built UI from a llama.cpp
  release at https://github.com/ggml-org/llama.cpp/releases and extract to
  tools/ui/dist.