error : CS0120 An object reference is required for the non-static field or method or property 'Calculator.opsObj'
7935
CS0120: An object reference is required for the nonstatic field, method, or property 'foo'
1605
What is the reason behind "non-static method cannot be referenced from a static context"?
109291
Expression of type 'System.Web.Mvc.MvcWebRazorHostFactory' cannot be used for return type 'System.Web.WebPages.Razor.WebRazorHostFactory'
122276
Error: Unable to generate a temporary class (result=1) ... When Invoking Methods on a Web Service
40950
Java7 ClassFormatError: Illegal local variable table length while creating the object
50046
java : non-static variable cannot be referenced from a static context Error
114049
IllegalMonitorStateException in code
93656
java.lang.ClassFormatError: Absent Code attribute in method that is not native or abstract in class file javax/faces/webapp/FacesServlet
150853
An object reference is required to access non-static member
3648
this class is not key value coding-compliant for the key XXXXXX
289
What is a NullReferenceException, and how do I fix it?
155627
Keyword 'this' (Me) is not available calling the base constructor
102497
Inserting text gives objectcollection error
63875
Where does error CS0433 "Type 'X' already exists in both A.dll and B.dll " come from?
79586
System.NullPointerException: Attempt to de-reference a null object
77057
What is causing 'CA2202: Do not dispose objects multiple times' in this code and how can I refactor?
139469
setValue:forUndefinedKey: this class is not key value coding-compliant for the key