I am getting this error when trying to delete an application listing in my code.

 DELETE http://localhost:3000/apps/9 500 (Internal Server Error) jQuery.ajaxTransport.send @ jquery.self-d03a5518f45df77341bdbe6201ba3bfa547ebba8ed64f0ea56bfa5f96ea7c074.js?body=1:9660 jQuery.extend.ajax @ jquery.self-d03a5518f45df77341bdbe6201ba3bfa547ebba8ed64f0ea56bfa5f96ea7c074.js?body=1:9211 $.rails.rails.ajax @ jquery_ujs.self-ca5248a2fad13d6bd58ea121318d642f195f0b2dd818b30615f785ff365e8d1f.js?body=1:84 $.rails.rails.handleRemote @ jquery_ujs.self-ca5248a2fad13d6bd58ea121318d642f195f0b2dd818b30615f785ff365e8d1f.js?body=1:162 (anonymous function) @ jquery_ujs.self-ca5248a2fad13d6bd58ea121318d642f195f0b2dd818b30615f785ff365e8d1f.js?body=1:384 jQuery.event.dispatch @ jquery.self-d03a5518f45df77341bdbe6201ba3bfa547ebba8ed64f0ea56bfa5f96ea7c074.js?body=1:4666 jQuery.event.add.elemData.handle @ jquery.self-d03a5518f45df77341bdbe6201ba3bfa547ebba8ed64f0ea5

any idea ?