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Error from Integromat (HTTP 400)

This is the error message I receive when I try to post a picture to Facebook through Bubble App using the Integromat plugin.

The page at “htps://” says:
The service Integromat -
ProphecyToFacebook just returned an error (HTTP 400). Please consult their documentation to ensure your call is set properly. Raw error:
Queue is full.

How do I fix this problem? Any help would be greatly appreciated.