When I attempted to preflight a particualr PDF I'm getting an "Uknown error (unknow exception)". This happens with any type of preflight, even to check the syntax issues. I've tried it on two separate computers, both with Acrobat Pro DC (version 2017.009.20044), and both came up with the same error.
When I attempted the same preflight on a 2015 version of Acrobat Pro DC it worked.
As anyone else come across this problem.
I've been able to preflight other PDFs, it's just the one that is causing issues.
Thanks for your report. Could you please share the file with which you are facing this issue?
I've extracted one page from the problem file. I've tried again and I'm unable to preflight even this single page.
You may download it from:
Thank you for looking into this issue.
Thanks for sharing the file. We are able to reproduce the error at our end. Issue has been forwarded to the concerned team for further investigations.
This issue was fixed in our update released yesterday. Make sure you are on the latest update by visiting Help > Check for updates (17.012.20093 Planned update, August 8, 2017 — Acrobat and Adobe Reader Release Notes).
Please try it out and let us know your feedback.
Excellent, thank you.
I've just checked the file with the latest update and it works perfectly.
May 2021 and I am getting this notification with the latest update.