Not sure how far you got before you got the error message;
I am afraid a few extra questions before I can make any suggestions.
- Was that in downloading/installing v1.7.2, or in trying to use it?
- Are the problems now happening even before you try to access the Sony?
- Is it a library book or a bought eBook that is giving the problem?
- Are all the devices set up with the correct time and in the correct timezone?