Workflow error - Cannot read property 'all' of undefined

Dear Friends,
I have a workflow endpoint which connects to the google calendar and returns the events of the calendar as JSON text.
It was working till yesterday and now it gives me the error code 500.
in the log also I got this : “Workflow error - Cannot read property ‘all’ of undefined”
Could you guide me what can be the reason of it?
I used the same API connector to manipulate data into the repeating group and it works very fast but when I want to use it in API workflow it does not work.

We’ll probably need a detailed bug report to help here

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