ZPIDBADARG, The tvexpr must be FALSE if last $ZPID() not found
Run Time Error: This indicates that a $ZPID() function specified an argument that was TRUE when no active PID scan was in progress.
Action: Review the routine to ensure that $ZPID() is first initialized with a FALSE truth-valued expression. $ZPID() cannot be invoked with a TRUE truth-valued expression unless the last $ZPID() returned a PID. If it has not been previously invoked, it must be first invoked with a FALSE truth-valued expression.