App inventor error 4200 : error from to chatbot code ; -1 fix

Please explain what your post is about
Is it a question? Is it a solution?

Taifun

This is a question I am looking for a solution to the error

See the FAQ

Taifun
PS: protip: this community does have a search feature...

https://community.appinventor.mit.edu/search?context=topic&context_id=138342&q=Chatbot%204200%20order%3Alatest&skip_context=true

either of these solutions works for me

You might need to use ResetConversation to reset the internal state of the chatbot if your image is huge. You may need to clear its cache.