what i think is that your installation of Abduct flyff was over another private server. if the files you have are not clean please download from this link.http://www.abductionempire.com/abductionflyff.exe
The abduct flyff patcher works with the flyff.a file. so no need to delete it.
Just ensure your Eflyff installation is clean & use the latest patcher.
(Have you updated the themes & new World Patch?)
GM - RikudoSennin