Similar entries 7.x-2.0 known error
This is not you, it is a bug in the module. I'm sorry to say that the fact that the bug goes back to September does not bode well for a fix.  Neither does the fact that there is only one active maintainer who has not made any changes since the releases in August.  If you are a coder, you might try fixing the code.  If not, you may want to look for other options.