asp.net mvc - MVC4 & EF5 System.ArgumentException: An item with the same key has already been added in ELMAH logs -


i getting "system.argumentexception: item same key has been added." in elmah log. application works fine on dev without exception. sure fields in entity have unique names. code:

  [httppost]         public actionresult create(candidate candidate)         {              if (modelstate.isvalid)             {                   candidate.createdon=candidate.updatedon = datetime.now;                  db.candidates.add(candidate);                 db.savechanges();                    //save original image & thumbnail                 if (request.files.count > 0)                 {                     candidate.photopath = persistimage(string.concat(candidate.name.split(' ')[0], "-", candidate.id.tostring()));                     candidate.resumepath = persistresume(string.concat(candidate.name.split(' ')[0], "-", candidate.id.tostring()));                     db.savechanges();                 }                 membershipuser user = membership.getuser(candidate.userid);                  if (!user.isapproved)                 {                     user.isapproved = true;                     membership.updateuser(user);                 }                 tempdata.add("info", usermessages.success);                 formsauthentication.setauthcookie(candidate.userid, createpersistentcookie: false);                 return redirecttoaction("listing", "job");             }             tempdata.add("info", usermessages.validationfailure);             viewbag.categoryid = cachemanager.getcategoryselectlist(convert.tostring(convert.tostring(candidate.categoryid)));            // viewbag.subcategoryid = new selectlist(db.subcategories, "id", "name", candidate.subcategoryid);             viewbag.qualificationid = new selectlist(cachemanager.getqualifications(), "id", "name", candidate.qualificationid);             viewbag.countryid = new selectlist(cachemanager.getcountries(), "id", "name", candidate.countryid);              return view(candidate);         }

stack trace:

system.argumentexception: item same key has been added.    @ system.throwhelper.throwargumentexception(exceptionresource resource)    @ system.collections.generic.dictionary`2.insert(tkey key, tvalue value, boolean add)    @ ointerns.controllers.candidatecontroller.create(candidate candidate)    @ lambda_method(closure , controllerbase , object[] )    @ system.web.mvc.actionmethoddispatcher.execute(controllerbase controller, object[] parameters)    @ system.web.mvc.reflectedactiondescriptor.execute(controllercontext controllercontext, idictionary`2 parameters)    @ system.web.mvc.controlleractioninvoker.invokeactionmethod(controllercontext controllercontext, actiondescriptor actiondescriptor, idictionary`2 parameters)    @ system.web.mvc.async.asynccontrolleractioninvoker.<>c__displayclass42.<begininvokesynchronousactionmethod>b__41()    @ system.web.mvc.async.asyncresultwrapper.<>c__displayclass8`1.<beginsynchronous>b__7(iasyncresult _)    @ system.web.mvc.async.asyncresultwrapper.wrappedasyncresult`1.end()    @ system.web.mvc.async.asynccontrolleractioninvoker.endinvokeactionmethod(iasyncresult asyncresult)    @ system.web.mvc.async.asynccontrolleractioninvoker.<>c__displayclass37.<>c__displayclass39.<begininvokeactionmethodwithfilters>b__33()    @ system.web.mvc.async.asynccontrolleractioninvoker.<>c__displayclass4f.<invokeactionmethodfilterasynchronously>b__49()    @ system.web.mvc.async.asynccontrolleractioninvoker.<>c__displayclass4f.<invokeactionmethodfilterasynchronously>b__49()    @ system.web.mvc.async.asynccontrolleractioninvoker.<>c__displayclass4f.<invokeactionmethodfilterasynchronously>b__49()    @ system.web.mvc.async.asynccontrolleractioninvoker.<>c__displayclass37.<begininvokeactionmethodwithfilters>b__36(iasyncresult asyncresult)    @ system.web.mvc.async.asyncresultwrapper.wrappedasyncresult`1.end()    @ system.web.mvc.async.asynccontrolleractioninvoker.endinvokeactionmethodwithfilters(iasyncresult asyncresult)    @ system.web.mvc.async.asynccontrolleractioninvoker.<>c__displayclass25.<>c__displayclass2a.<begininvokeaction>b__20()    @ system.web.mvc.async.asynccontrolleractioninvoker.<>c__displayclass25.<begininvokeaction>b__22(iasyncresult asyncresult)

i have checked below thread of no avail

an item same key has been added


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