Perhaps this should be moved to the calibre devices forum?
The only time I've seen that error from calibre is when it has run out of memory trying to convert a book using the 32 bit calibre under Windows.
What OS and type of calibre install are you using? Windows (x86 or x64), Mac, Linux? Portable or install?
How much free space is left on your Forma?
Edit: Good to hear the problem went away. Though I do wish it had hung around to be swatted.
Last edited by DNSB; 11-25-2020 at 02:14 PM.
Reason: OP reported problem disappears after restart.
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