Compiler error C0241

Message: Second Operand of __QueryPointer must be pointer

Possible error cause: Incorrect operands are passed to the operator ‎__QueryPointer‎.

Error correction: Pass a pointer.

Example of the error:

PROGRAM PLC_PRG
VAR
	b : INT;
	ITFref : ITF;
	pt : POINTER TO FB;
END_VAR

__QueryPointer(ITFref,b);

INTERFACE ITF EXTENDS __System.IQueryInterface

--> C0241:  Second Operand of __QueryPointer must be pointer

Error correction:

Example:
__QueryPointer (ITFref, pt);