Ahh, found a bug

I however don't understand why it didn't work after you yourself created the "backup" folder... Hope you didn't created it the right place

I've just tried it myself, and 2.2.6 returned the same error here, but my "internal" version passed with flying colors

(however, 2.2.6 also did when I created the "backup" folder (C:\Programmer\ZSoft\Uninstaller\backup))
I hope that it will also work for you in the next version.
Thank you for reporting this bug!
(PS: Moving post to the bug-forum)