System.Reflection.TargetInvoca...

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EF6.0

I got following exception when updating data from my database table
Exception : System.Reflection.TargetInvocationException' occurred in EntityFramework.SqlServer.dll but was not handled in user code

Here My Code

private bool updateUser(UserCategoryModel userCategory)
 {
     using (var db = new EntityContext())
     {
         var currentUserCategory = db.UserCategories.FirstOrDefault(e => e.UserName == userCategory.UserName);
         db.Entry(currentUserCategory).State = EntityState.Modified;
         currentUserCategory.Catergories = userCategory.Catergories;
         db.SaveChanges();
         return true;
     }
     return false;
 }