Title: [Bug]: Chat and Agent modes fail with ERROR: no such method when using local Ollama (v1.0.0-rc3)

[liyunpeng1216]

Environment:

RAGFlow version: v1.0.0-rc3 (Docker deployment on Windows)

Hardware: RTX 5070 Ti (16GB VRAM), 64GB RAM

LLM: Local Ollama

qwen2.5:14b (also tried qwen3.5-nothink:latest)

Embedding: Local Ollama bge-m3

Description:
I am running RAGFlow completely offline. My knowledge base has ~7297 files.

The strange part:

Retrieval testing works perfectly. It successfully returns 64 highly relevant chunks with proper similarity scores (Keyword + Vector).

Chat and Agent modes are broken. Every time I try to send a message in the Chat UI, I immediately get ERROR: no such method. In Agentic mode, it generates a "Thought" process, tries to use grep_chunks, and then fails with ERROR: agentic_rag: finalizeAnswer produced empty output.

Expected behavior:
The Chat mode should use the retrieved chunks to generate an answer via Ollama.

Actual behavior:
It seems the Go backend of rc3 is failing when trying to communicate with Ollama during the generation phase. I suspect it's related to unimplemented methods in the Go Ollama driver (e.g., CheckConnection or similar returning "no such method").

Logs / Error Messages:

text
ERROR: no such method
(Agentic mode error):

text
ERROR: agentic_rag: finalizeAnswer produced empty output

[g4lb]

The bare no such method comes from Rerank() in the Ollama driver. Ollama has no rerank method in rc3.

• internal/entity/models/ollama.go - Rerank returns this error
• internal/service/nlp/reranker.go - retrieval calls Rerank

Your chat likely uses an Ollama rerank model. Remove it in the chat settings.

[liyunpeng1216]

Thanks for the clear explanation — that makes sense. I removed the Ollama rerank model in the chat settings and it's working now. Really appreciate your help!

[wangq8]

@liyunpeng1216 could you please paste more error logs?

[wangq8]

@liyunpeng1216
Can you try "naive" mode is it work?
The "agentic" mode, need the model to support tool call, I think qwen2.5:14b (also tried qwen3.5-nothink:latest) might not be supporting tool call.

[wangq8]

#21925 I raised a PR to enhance the error message.

[liyunpeng1216]

Thanks for your attention. This is resolved now. I remove the Ollama rerank model in the chat settings. Appreciate it!