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Last night my apps were working fine, this morning I am getting this error:

Looks like to do with pandas and my excel file

ValueError: Excel file format cannot be determined, you must specify an engine manually. 2022-09-09 13:56:55,276: Error running WSGI application 2022-09-09 13:56:55,277: ValueError: Excel file format cannot be determined, you must specify an engine manually. 2022-09-09 13:56:55,277: File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 2069, in call 2022-09-09 13:56:55,277: return self.wsgi_app(environ, start_response)

I didn't change anything to my app since last night. I am getting the same error on another app that I haven't played with in a while too.

Did PythonAnywhere just install a new pandas version to all the servers or something maybe?

Any ideas what might have happened, Im not sure how to tackle this error :(

Based on our email exchange, this was a user uploading a file that was not an Excel file.