Quote:
Originally Posted by kilikini
I was also receiving this error while adding prc/mobi files and using the mobidedrm plugin, but after updating the plugin to the latest version of mobidedrm, 0.10, the error no longer occurs and calibre is again able to read the metadata successfully. 
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Thanks for the lead! For the moment, I disabled the plugin and the import worked perfectly.
Thank you both for the incredibly quick reply!