Thanks a lot!, it worked perfect got the app working again...
Just in case someone else needs this sometime .. here is what I did:
1) Deleted everything that had to do with the Backup Assistant
2) Deleted dalvik-cache with TiBu (don't think it's necessary, but just in case)
3) Pushed BackupAssistanceClient.apk and BuaContactAdapter.apk to /mnt/sdcard
4) Copied those files from /mnt/sdcard to /system/app
5) Changed permissions with busybox chmod u+rw-x,g+r-wx,o+r-wx <filename>.apk (did it on both files)
6) Rebooted phone.