An automatic variable or subroutine argument value appears in a monitor command but the specified program is not on the execution stack for the specified program task. Automatic variables and subroutine arguments have values only when the program that defines them is on a stack. Change the monitor command to not reference the variables. Make sure that the program is on the expected execution stack. You can place a PAUSE instruction or breakpoint in the program to stop it while it is on the execution stack.