This message appears when a program line references an out-of-range head number. The program run is canceled when Abort is clicked. Edit the program to change the head. Then re-run the program.
This error is a result of a programing error. It is caused by a process line defined to use a Valve/Tool other than those available in the program mount table. Be sure all the lines in a program and all shapes within are not set to use an available tool or to use the default tool.