Compiler error C0038

Message: '<invalid output>' is no output of '<function name>'

Possible error cause: A local variable is handled as an output in a function call.

Error correction: Declare the variable as an output parameter.

Example of the error:

PROGRAM PLC_PRG
VAR
	 i : INT;
	 x : INT;
END_VAR
i := TEST(iVar => x);

FUNCTION TEST : INT
VAR
	iVar : INT;
END_VAR


--> C0038: 'iVar' is no output of 'TEST'

Error correction:

Example:
VAR_OUTPUT
	iVar : INT;
END_VAR