'type' does not contain a definition for 'member' and no extension method 'name' accepting a first argument of type 'type' could be found (are you missing a using directive or an assembly reference?).
This error occurs when you try to call a method or access a class member that does not exist.
The following example generates XS1061 because TestClass1 does not have a DisplaySomething method. It does have a method that is called WriteSomething. Perhaps that is what the author of this source code meant to write.
// XS1061.prg