Before posting, please scroll through previous posts on GenP Revolt as this issue has been addressed before, with images showing the same error you're experiencing, like here and here. The replies posted there would have given you the answer without needing to post again.

Two things you can do, as mentioned previously:

Ensure you are not using an outdated version of GenP and are always using the latest release, as there was an issue with older versions of GenP with Acrobat, but unless you’re still using an earlier version, this shouldn't be an issue now. Ensure Acrobat is properly installed and that your antivirus hasn’t blocked or quarantined the file after patching.

If the issue persists, use the Acrobat Cleaner Tool from here to completely uninstall Acrobat. Then, reinstall and repatch with GenP v3.6.6. After patching, open Acrobat to see if the error occurs again. If it does, it's likely due to your antivirus blocking or quarantining the modified file created during patching. Check your antivirus quarantine folder and remove the file if found. Alternatively, simply exclude Acrobat from antivirus scanning, and it should work fine. Avoid using the Windows repair option, as it may not clear everything. If it isn't the antivirus causing the issue, using the repair function might not resolve the underlying problem.

Did you try reinstalling the program?