Run with Wayland backend

[alfiedouglas-tewke]

After following the docs, I have been trying to run with Wayland backend, however I get the error which I have been unable to resolve:

./flutter-client --bundle=./sample/build/linux/x64/release/bundle/
embedder.cc (939): 'FlutterEngineInitialize' returned 'kInvalidArguments'. Not running in AOT mode but could not resolve the kernel binary.
[ERROR][flutter_linuxes_engine.cc(221)] Failed to start Flutter engine: error 2
Failed to create view controller.
Failed to create a Flutter window.

Any help would be greatly appreciated! Thanks

[jcviau]

@alfiedouglas-tewke maybe related to #4 (comment). Similar issue (kInvalidArguments).

[alfiedouglas-tewke]

@jcviau moving the bundle in to /usr/bin didn't fix it unfortunately, I still get the same error

[HidenoriMatsubayashi]

@alfiedouglas-tewke

embedder.cc (939): 'FlutterEngineInitialize' returned 'kInvalidArguments'. Not running in AOT mode but could not resolve the kernel binary.

I guess you built libflutter_engine.so with debug mode. If so, you need a bundle that is built with debug mode.

How to build with debug mode:

$ flutter build linux --debug

How to run

./flutter-client --bundle=./sample/build/linux/x64/debug/bundle/

[alfiedouglas-tewke]

@HidenoriMatsubayashi

I guess you built libflutter_engine.so with debug mode. If so, you need a bundle that is built with debug mode.

I downloaded libflutter_engine.so (with the master hash) from https://storage.googleapis.com/flutter_infra/flutter/FLUTTER_ENGINE/linux-x64/linux-x64-embedder.

I have just tried building the flutter app with --debug, and I now get this error when running:

$ ./flutter-client --bundle=./sample/build/linux/x64/debug/bundle
flutter: Observatory listening on http://127.0.0.1:38589/a-ZaU5K8tTc=/
[ERROR:flutter/shell/common/shell.cc(103)] Dart Error: Can't load Kernel binary: Invalid kernel binary format version.
[ERROR:flutter/runtime/dart_isolate.cc(171)] Could not prepare isolate.
[ERROR:flutter/runtime/runtime_controller.cc(415)] Could not create root isolate.
[ERROR:flutter/shell/common/shell.cc(588)] Could not launch engine with configuration.

Seems like it's related to #4 (comment)

[HidenoriMatsubayashi]

Could you make sure that the downloaded libflutter_engine.so version matches the Flutter SDK version?

Flutter SDK: ${path_to_flutter_sdk_install}/flutter/bin/internal/engine.version

Downloaded Engine version: check FLUTTER_ENGINE
https://storage.googleapis.com/flutter_infra/flutter/FLUTTER_ENGINE/linux-x64/linux-x64-embedder

[HidenoriMatsubayashi]

The current procedure is not easy for beginners, so we are currently considering making a tool.
See: #59

[charafau]

@HidenoriMatsubayashi unfortunetly I have the same problem, I replaced hash in my flutter installation:

➜  internal git:(dev) pwd 
/home/charafau/Utils/flutter/bin/internal
➜  internal git:(dev) cat engine.version 
26e217e6c3d487bb3c0cbf8a7edb378952a51d33

then downloaded engine with wget:

➜  flutter-embedded-linux git:(master) ✗ wget https://storage.googleapis.com/flutter_infra/flutter/26e217e6c3d487bb3c0cbf8a7edb378952a51d33/linux-x64/linux-x64-embedder
--2021-05-26 03:25:46--  https://storage.googleapis.com/flutter_infra/flutter/26e217e6c3d487bb3c0cbf8a7edb378952a51d33/linux-x64/linux-x64-embedder

my build folder:

➜  build git:(master) ✗ ls
CMakeCache.txt  CMakeFiles  cmake_install.cmake  libflutter_engine.so  Makefile

I build sample flutter app like so

➜  sample git:(master) ✗ flutter build linux 

and run it:

 ➜  build git:(master) ✗ ./flutter-client --bundle=./sample/build/linux/x64/release/bundle
embedder.cc (982): 'FlutterEngineInitialize' returned 'kInvalidArguments'. Not running in AOT mode but could not resolve the kernel binary.
[ERROR][flutter_linuxes_engine.cc(221)] Failed to start Flutter engine: error 2
Failed to create view controller.
Failed to create a Flutter window.

maybe something on server has changed? when I caculate that zip file instead of my sum ( 26e217e6c3d487bb3c0cbf8a7edb378952a51d33 )

I get:

➜  flutter-embedded-linux git:(master) ✗ sha1sum linux-x64-embedder 
02de140e89b21eb39ad309d0d85eaaef13e76d12  linux-x64-embedder
➜  flutter-embedded-linux git:(master) ✗ sha1sum libflutter_engine.so 
44b401b44f34b25a5a13cdeef2f3e36be24a1aaa  libflutter_engine.so

unless it's not sha1sum but that's my only idea

I run ubuntu 21.04 and try to build standalone wayland application

[HidenoriMatsubayashi]

@charafau

Thank you for your comment.

https://storage.googleapis.com/flutter_infra/flutter/26e217e6c3d487bb3c0cbf8a7edb378952a51d33/linux-x64/linux-x64-embedder

This library (libflutter_engine.so) is for debug mode. (Not release mode)

➜ sample git:(master) ✗ flutter build linux

This command is for release build. So, you need to use the following command.

$ flutter build linux --debug
$ ./flutter-client --bundle=./sample/build/linux/x64/debug/bundle

[charafau]

@HidenoriMatsubayashi Thank you, I tried that yesterday and didn't work for me, tried again today and it works... guess it's good not to program at night ;) thanks!

[HidenoriMatsubayashi]

tried again today and it works

Good, good! You're welcom.

[alfiedouglas-tewke]

Hi @HidenoriMatsubayashi,

Could you make sure that the downloaded libflutter_engine.so version matches the Flutter SDK version?

Yeah I have just retried ensuring the same version is used. Here is the process and error:

$ mkdir build
$ cd build
build$ which flutter
/opt/flutter/bin/flutter
build$ cat /opt/flutter/bin/internal/engine.version 
b1385c0df12549b9dce7ce3fee361bd4898f49ae
build$ curl -O https://storage.googleapis.com/flutter_infra/flutter/b1385c0df12549b9dce7ce3fee361bd4898f49ae/linux-x64/linux-x64-embedder
build$ unzip linux-x64-embedder 
Archive:  linux-x64-embedder
  inflating: flutter_embedder.h      
  inflating: libflutter_engine.so 
build$
build$ cmake -DUSER_PROJECT_PATH=examples/flutter-wayland-client ..
[...]
build$ make
[...]
build$
build$ flutter create sample
[...]
build$ cd sample
build/sample$ flutter build linux --debug
build/sample$ cd ..
build$
build$ ./flutter-client --bundle=./sample/build/linux/x64/debug/bundle/
flutter: Observatory listening on http://127.0.0.1:41017/uNq9rCHGCQQ=/
[ERROR:flutter/shell/common/shell.cc(103)] Dart Error: Can't load Kernel binary: Invalid kernel binary format version.
[ERROR:flutter/runtime/dart_isolate.cc(171)] Could not prepare isolate.
[ERROR:flutter/runtime/runtime_controller.cc(415)] Could not create root isolate.
[ERROR:flutter/shell/common/shell.cc(588)] Could not launch engine with configuration.

I have also tried with building the flutter app with --release and the error I get is the original one:

build$ ./flutter-client --bundle=./sample/build/linux/x64/release/bundle/
embedder.cc (939): 'FlutterEngineInitialize' returned 'kInvalidArguments'. Not running in AOT mode but could not resolve the kernel binary.
[ERROR][flutter_linuxes_engine.cc(221)] Failed to start Flutter engine: error 2
Failed to create view controller.
Failed to create a Flutter window.

[charafau]

@alfiedouglas-tewke for your debug build, do yo have libflutter_engine.so in you LD_LIBRARY_PATH ?

try to run this inside your build directory

export LD_LIBRARY_PATH=.

[alfiedouglas-tewke]

@charafau that was it! Thanks a lot!