Problem in credits mod.

[LoF]

I've just installed the vBCredits 1.3 mod in vbulletin 3.6.8.
I have a problem:
When I want to donate user, I write the username, comments and amount.
Then I click "donate" - and it shows me an error:
"Invalid Specified"

What is the problem?

[Paul M]

Please post in the modifications support thread.