File processing error with PDF file convestion

I keep getting this error:

Trace ID: 9c42e05b-1c5b-4b02-ae55-1cbb4b09c5e3_et_2d0c9719-bcce-11f0-b7ea-dad08ca81947

Name,Code,Value
2,FPS_ERROR,File processing error: The conversion was not successful. Object reference not set to an instance of an object.

Then I retry and next it repeats the same error and it will not process the file. It is a PDF of a book and it has drawings in it...

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