Object reference not set to an instance of an object.
289
What is a NullReferenceException, and how do I fix it?
68222
Reference to undeclared entity exception while working with XML
88920
Is using NULL references OK?
59517
FATAL_ERROR|System.QueryException: List has no rows for assignment to SObject
119542
What does "Illegal assignment from Schema.SObjectField to String" mean?
126921
Nonstatic method cannot be reference from a Static context
136768
this class is not key value coding-compliant for the key view
46857
Compiler warning: null reference exception
49933
How can I get a reference to a method?
99404
'int' object is not callable
138687
How to fix "System.QueryException: List has more than 1 row for assignment to SObject"
78212
[__NSCFDictionary objectAtIndex:]: unrecognized selector sent to instance
139469
setValue:forUndefinedKey: this class is not key value coding-compliant for the key
87728
ArgumentNullException or NullReferenceException from extension method?
2116
IllegalArgumentException or NullPointerException for a null parameter?
93966
The ViewData item that has the key 'XXX' is of type 'System.Int32' but must be of type 'IEnumerable'
49
What is a NullPointerException, and how do I fix it?