I don’t see any error, it’s a successful conversion. It’s how you’ve configured MCEBuddy, you’ve checked the skip re-conversion option in your Conversion Task Expert Settings page:
Skip ReProcessing -> True
WARNING> 2019-01-10T16:46:16 MCEBuddy.Engine.ConversionJob --> Destination file \Storage\Media\TIVO\Bull - S02E10 Home for the Holidays.mp4 found converted in HISTORY, skipping re-conversion - SUCCESSFUL processing
A file with a similar name was converted in the past and since you’ve checked the Skip re-conversion option it won’t convert another file with the same filename again.