If you're using the newest version (the Ultimate Bendy Mod v2.0) then make sure you extracted the files in the Data folder and NOT the folder where the exe is at.
or
If you're using the Ultimate Bendy Mod v1.7 (Menu version) then make sure it isn't in the data folder. You have to extract that version in the folder with exe in it.
If you're using the newest version (the Ultimate Bendy Mod v2.0) then make sure you extracted the files in the Data folder and NOT the folder where the exe is at.
or
If you're using the Ultimate Bendy Mod v1.7 (Menu version) then make sure it isn't in the data folder. You have to extract that version in the folder with exe in it.