template Data Analyst app failed with error

I tried out the Data Analyst app that analyzes GSheet. However, initially the app complained about

👉 400 Thread messages or instructions must contain the word 'json' in some form to use 'response_format' of type 'json_object'.

Then I added the "output format in JSON" in the instruction. But it failed with a different error message:

👉 400 Runs with response_format of type json_object type are only compatible if all tools are type function.

Now I am not sure what this means. I thought the template was supposed to work out of the box. Any ideas?
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