Run failed: ‘can only concatenate str (not “list”) to str’ when using llama-3-sqlcoder-8b model in Chatflow

[ChenZixinn]

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Dify version

0.13.0

Cloud or Self Hosted

Self Hosted (Docker)

Steps to reproduce

When using the llama-3-sqlcoder-8b (Completion) model in Chatflow, the following error occurs:

Run failed: can only concatenate str (not "list") to str.

However, the model works correctly in Chatbot Basic.

Environment Details:

​ • Model: llama-3-sqlcoder-8b (Completion)

​ • Hosting Platform: Xorbits Inference

​ • Error Context: Chatflow usage

Screenshots:

​ 1. Chatflow Run Failure

​ 2. Chatbot Basic Working Normally

Steps to Reproduce:

​ 1. Install the llama-3-sqlcoder-8b model on Xorbits Inference.

​ 2. Configure it in Chatflow.

​ 3. Execute a request.

​ 4. Observe the error message.

✔️ Expected Behavior

The model should run in Chatflow without errors, just as it does in Chatbot Basic.

❌ Actual Behavior

Run fail.

[dosubot]

The error "can only concatenate str (not 'list') to str" suggests that there is an attempt to concatenate a string with a list in the Chatflow environment. This issue might be due to how the Chatflow component processes inputs or outputs differently compared to Chatbot Basic.

To resolve this, you should check the following:

1. Data Types: Ensure that the data types being passed to the model in Chatflow are consistent with what the model expects. The Chatflow component expects specific data types such as String, Array[File], Number, Object, Array[String], Array[Number], and Array[Object] ^[1][2].

2. Variable Handling: Review how variables are being handled in your Chatflow setup. There might be a variable that is expected to be a string but is being passed as a list.

3. Concatenation Logic: Look into the part of the Chatflow code where concatenation is happening. Ensure that all concatenations involve only strings or properly convert lists to strings if needed.

By addressing these areas, you should be able to identify and fix the source of the error.

To continue talking to Dosu, mention @dosu.

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[yihong0618]

fixed in #11504
can you try the latest version?

[ChenZixinn]

I tried on https://cloud.dify.ai, It's the latest version?

[crazywoola]

I tried on https://cloud.dify.ai, It's the latest version?

No, this just merge yesterday. I think this is not on the Cloud.

[ChenZixinn]

Thanks. It's working as expected.

[Ryuukeisyou]

Hi, I have also encountered the same problem, "can only concatenate str (not "list") to str
", with completion models like Llama_3_2_3B_Instruct_Q8_0 and qwen2_5_7b_instruct_q8_0.

I tried updating dify to latest version using:
cd dify/docker
docker compose down
git pull origin main
docker compose pull
docker compose up -d

but the problem still exist. This is the dsl I am using. Any help would be appreciated. Thank you! @crazywoola
test_00.zip

[yihong0618]

Hi, I have also encountered the same problem, "can only concatenate str (not "list") to str ", with completion models like Llama_3_2_3B_Instruct_Q8_0 and qwen2_5_7b_instruct_q8_0.

I tried updating dify to latest version using: cd dify/docker docker compose down git pull origin main docker compose pull docker compose up -d

but the problem still exist. This is the dsl I am using. Any help would be appreciated. Thank you! @crazywoola test_00.zip

Thanks, will check it .

[ChenZixinn]

It seems like you are using Docker, and I'm not sure if it is up to date.
In my case, I rebuild the API and WORKER image in the latest version.

[yihong0618]

Hi, I have also encountered the same problem, "can only concatenate str (not "list") to str ", with completion models like Llama_3_2_3B_Instruct_Q8_0 and qwen2_5_7b_instruct_q8_0.

I tried updating dify to latest version using: cd dify/docker docker compose down git pull origin main docker compose pull docker compose up -d

but the problem still exist. This is the dsl I am using. Any help would be appreciated. Thank you! @crazywoola test_00.zip

there's no problem in my side using your dsl please use latest code and retry