Dify reported an error when displaying file iterations, indicating "invalid iterator value: value_type=<SegmentType.ARRAY_FILE: 'array[file]'> ."

[qkfm-97]

Self Checks

• This is only for bug report, if you would like to ask a question, please head to Discussions.
• I have searched for existing issues search for existing issues, including closed ones.
• I confirm that I am using English to submit this report (我已阅读并同意 Language Policy).
• [FOR CHINESE USERS] 请务必使用英文提交 Issue，否则会被关闭。谢谢！:）
• Please do not modify this template :) and fill in all the required fields.

Dify version

0.14.2

Cloud or Self Hosted

Self Hosted (Docker)

Steps to reproduce

this is the full error

invalid iterator value: value_type=<SegmentType.ARRAY_FILE: 'array[file]'> value=[File(dify_model_identity='dify__file', id=None, tenant_id='4d6d8447-60c2-4488-b6cd-e110602a1db5', type=<FileType.DOCUMENT: 'document'>, transfer_method=<FileTransferMethod.LOCAL_FILE: 'local_file'>, remote_url='', related_id='388974e9-df07-430b-91e8-b31aa058017a', filename='第01集知识点总结.pdf', extension='.pdf', mime_type='application/pdf', size=373038), File(dify_model_identity='dify__file', id=None, tenant_id='4d6d8447-60c2-4488-b6cd-e110602a1db5', type=<FileType.DOCUMENT: 'document'>, transfer_method=<FileTransferMethod.LOCAL_FILE: 'local_file'>, remote_url='', related_id='0f27b89f-bfaf-4460-8c37-c9e8a15f7a93', filename='第07集知识点总结.pdf', extension='.pdf', mime_type='application/pdf', size=509967)] id='80b1a8ed-9e84-470f-8ec5-69dac4a44951' name='filearr' description='' selector=['1735529468276', 'filearr'], please provide a list.

✔️ Expected Behavior

No response

❌ Actual Behavior

No response

[dosubot]

Hey there, @qkfm-97! I'm here to help you with any bugs, questions, or contributions you have for the Dify project. Let me know how I can assist you with the reported error.

I found a similar closed issue that might help you resolve the error you're encountering. The solution involves updating your Dify installation to a version that includes the fix from PR #12035. This fix modifies the ArrayFileVariable to properly inherit from ArrayVariable, allowing array files to be used correctly in iteration nodes.

If updating is not immediately possible, you can manually modify the file /app/api/core/variables/variables.py in your Docker container by changing:

class ArrayFileVariable(ArrayFileSegment, Variable)

to:

class ArrayFileVariable(ArrayFileSegment, ArrayVariable)

After making this change, restart your Docker compose setup. Additionally, ensure you add a 'list filter' node to handle the array of files, as sys.files is an Array[File] type variable, not a single File type. This will help process the file array correctly in your workflow ^[1].

To continue talking to Dosu, mention @dosu.

---

^{Help Dosu learn! Give it feedback: Great Response | Irrelevant Answer | Incorrect Sources | Too Verbose | Hallucination | Other}

[crazywoola]

See above answer.