An object reference is required for the non-static field or method or property
7935
CS0120: An object reference is required for the nonstatic field, method, or property 'foo'
49
What is a NullPointerException, and how do I fix it?
126921
Nonstatic method cannot be reference from a Static context
119667
apex:inputField can only be used with sObjects
121471
Reference type still needs pass by ref?
74590
Why do I need "field:" in my attribute declaration "[field:NonSerialized]"?
93966
The ViewData item that has the key 'XXX' is of type 'System.Int32' but must be of type 'IEnumerable'
129417
Use of uninitialized final field - with/without 'this.' qualifier
1477
Using property() on classmethods
95280
Do declared properties require a corresponding instance variable?
75987
How do you use the non-default constructor for a member?
165
Reference could not be added because of same name
80299
Java Error: Cannot make a static reference to the non-static method
44561
How to reference non-static variable name from static context?
108336
Nullable Object must have a value #2
42612
Generics, arrays, and the ClassCastException
9073
Cannot make a static reference to the non-static method