I've been getting this error in one of my feeds lately. The output doesn't seem to give much helpful information however. Here's the error message:
INFO download feed9 Downloading: <File>
CRITICAL task feed9 BUG: Unhandled error in plugin deluge: !!Loop Protection!! We have tried to solve 3 time(s) in a row.
RuntimeError: !!Loop Protection!! We have tried to solve 3 time(s) in a row.
CRITICAL manager feed9 An unexpected crash has occurred. Writing crash report to /<path>/.flexget/crash_report.2020.02.08.173530036332.log. Please verify you are running the latest version of flexget by using "flexget -V" from CLI or by using version_checker plugin at http://flexget.com/wiki/Plugins/version_checker. You are currently using version 3.1.21
WARNING task feed9 Aborting task (plugin: deluge)
Is this a known bug, is there a fix? Is there more information I can provide?