Looks like that RTF file is missing in the library. Try adding it again.
Quote:
Originally Posted by Gromit
B11 is loading fine, seeing the UK Sony Reader but
fails to convert to RTF with following error
argument 1 must be string or read-only buffer, not None
Detailed traceback:
Traceback (most recent call last):
File "/Users/Steve/Downloads/calibre.app/Contents/Resources/main.py", line 947, in convert_single
File "/Users/Steve/Downloads/calibre.app/Contents/Resources/main.py", line 926, in convert_single_others
TypeError: argument 1 must be string or read-only buffer, not None
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