Hi Luis no you’re not the only one 
A few of my colleagues installed some custom pdf packages for the purposes of a case study and the workflow executed fine for a day, then the next day it returned the same error and would not run. Unfortunately the only way to get your workflow to run again would be to migrate it to a new file and ensure you only have the “UIPath.PDF.Activities” package installed this time round. Also do not copy and paste the activities of the workflow as it seems the error pops up again.
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