Solution for An object reference is required for the non-static field, method, or property
7935
CS0120: An object reference is required for the nonstatic field, method, or property 'foo'
119542
What does "Illegal assignment from Schema.SObjectField to String" mean?
34945
(object) is a 'field' but is used like a 'type'
61861
Extension methods must be defined in a non-generic static class
64332
avoiding null reference exceptions
68222
Reference to undeclared entity exception while working with XML
151292
Missing return statement in a non-void method compiles
10447
Adding a Method to an Existing Object Instance
11951
Should I use properties or direct reference when accessing instance variables internally?
7182
Identifying and solving javax.el.PropertyNotFoundException: Target Unreachable
80299
Java Error: Cannot make a static reference to the non-static method
15836
Cannot refer to a non-final variable inside an inner class defined in a different method
50046
java : non-static variable cannot be referenced from a static context Error
85201
"Cannot create an instance of the abstract class or interface" C# error message
138618
How to resolve NullPointerException error in my below POM code?
37988
System.NullPointerException: Attempt to de-reference a null object:
33438
Using sObject.get() to fetch a field value from a related parent object