PDR0716S
Section, Line number, Column number; Function function, Argument argument: The expression must be a variable.
What happened: You specified something other than a variable as the value for a function call argument that can only be a variable. Section identifies the section of the rule file that contains the errant function call; number identifies the line and column in which the function was found; function identifies the function call; argument identifies the argument that contains the invalid expression.
What to do: Specify a variable name as the value for the indicated argument.