Custom destinations

hi, upgraded to freepbx 2.4 over trixbox. in inbound routes there was no custom-app (for ivr application) . went to tools/custom modules to enable them (read in the forum). problem : when i try to add custom destination, under destination quick-pick drop down i dont see any options …whys that so ? if i try to save it like that it says : "invalid,destination, cannot be blank,must be foramted to exten,context,pri …wht am i doing right…pls help as am scratching a lot