Specified argument was out of the range of valid values in edmx designer file -


i using edmx model file . have below method fetch data having 2 columns: 

public list<schedulefrom> fetchschedulefromlist()         {             schedulingmodel db = new schedulingmodel();             var schedulelist = db.schedulings.select(s => new { s.scheduleid, s.scheduleslotfrom }).tolist();             list<schedulefrom> schedulefromlist=new list<schedulefrom>();             foreach(var schedulefromdata in schedulelist)             {                 schedulefrom schedulefromobj=new schedulefrom();                 schedulefromobj.scheduleid=schedulefromdata.scheduleid;                 schedulefromobj.schedulefromslot=schedulefromdata.scheduleslotfrom;                 schedulefromlist.add(schedulefromobj);             }             return schedulefromlist;         }  while running when flow comes 2nd line of code var schedulelist = db.schedulings.select(s => new { s.scheduleid, s.scheduleslotfrom }).tolist();  throws "specified argument out of range of valid values.".  when pressed f11 more details, found under model designer.edmx file under below method, exception coming from.   public objectset<scheduling> schedulings  {                  {              if ((_schedulings == null))            {                _schedulings = base.createobjectset<scheduling>("schedulings");            }                return _schedulings;             }         }

for line of code in above method _schedulings = base.createobjectset saying parameter out of range of valid values. earlier same code working fine , not sure changes impacted this. please suggest issue.


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