Definition of method <method> is not accessible in this context
An aggregate function that does not exist has been included with the Into operator.
Error ID: BC36594
To correct this error
Check the spelling of the aggregate function name and make any necessary corrections.
Add the method as a custom aggregate function (extension method). For more information about creating a custom aggregate function, see Aggregate Clause (Visual Basic).
See Also
Concepts
Introduction to LINQ in Visual Basic
Reference
Aggregate Clause (Visual Basic)
Group By Clause (Visual Basic)
Group Join Clause (Visual Basic)