Heavy handed A/V is the usual for this
You do not need to learn Python (unless you want to).
The bottom line of the error report is a pretty good summary of what balked.
In this case, you started a task that hands it off to worker_process to grind in background while you continue to browse your library.
In this case, the hand-off was interfered with .
Tell you A/V Calibre.exe is a good guy (calibre-parallel.exe is the worker. You may see more than 1 in the Task Manager depending on your CPU specs and Calibre settings)
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