Sage 50 also has some error, problem and issues. These functional, as well as technical error problems, usually occur for a variety of reasons. Among all the errors, users mostly Sage 50 PDF problems which creates major problems and blocks all the running processes. Can you provide more details about the problem I'm experiencing?
Here are some general troubleshooting steps that you can follow:

Check that your Sage 50 software and your PDF reader software are both up-to-date.
Make sure that your PDF reader is set as the default program for opening PDFs on your computer.
Verify that the PDF creator is correctly configured in Sage 50. You can check this by going to File > Forms > PDF Options.
If the issue persists, try reinstalling the PDF creator within Sage 50.
If none of the above steps work, you may want to contact Sage 50 support for further assistance.
I hope this helps, but please feel free to provide more details or ask further questions if needed.