EXTMERR

977

Extension method method/parameterproblem

An error has occurred due to one of the following reasons:

• The specified extension method has no parameters. It must have at least one.
• The extension method you declared is non-static. It must be static.
• You declared an extension method in a class that is either generic or non-static (or both).
• The extension method’s first parameter type is a group or a non-CLS structure.