I just thought it might be useful to document (in the error codes wiki) the E_AUTH_USER_AUTH error code: something along the lines of:
This error occurs if the XML signature is invalid and can't be parsed properly. This either means something went wrong when generating the signature, or it's an Adobe server issue.
If this happens with the Calibre plugin, please open a bug report.
I just thought it might be useful to document (in the error codes wiki) the
E_AUTH_USER_AUTH
error code: something along the lines of: