It should not cause an error if the windowsliveappid is empty, it will cause an error if there is not a valid windowsliveappid. Maybe it was not empty but had a space in it which made it seem like it was empty.
This error does not make me think it was really empty.
System.ArgumentException: Error: AppId: Application ID must be alphanumeric
If you want to send me the log I will look at it, maybe there were other errors.