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Gemini Pro function call tooling errors - "I am sorry, I cannot fulfill this request"

I'm using the gemini-pro model with the function calling functionality using the Vertex AI Java SDK.

I run the same prompt that is supposed to call the function but 1 out of 5 tries Gemini does not call the function but instead it replies: I am sorry, I cannot fulfill this request. The available tools lack the desired functionality.

It's not even an error or anything, it simply replies "I am sorry, I cannot fulfill this request. The available tools lack the desired functionality." which is not a nice output to present to users

Is anyone experiencing  this behavior?

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