dojox.widget.DialogSimple : Unable to load

Error:

 RequestError: Unable to load /slaps/app/setup/aprSession/edit/APRS1?dojo.preventCache=1355475120302 status: 404  

 .cache.dojo/errors/create/</</_56d()dojo.js (line 15)  
 _3dd()dojo.js (line 15)  
 _3e9()dojo.js (line 15)  
 ...);var _350=_33a(_34e,{el:1});var qt=_34e.tag;var _351=("*"==qt);var ecs=_300()["...  

Punca: 

Tidak boleh load sebab tiada request mapping sesuai dalam controller