The program is not loaded or contains errors.

Cause:

1. The start key is pressed to run the program when no program is loaded.
2. The program is loaded but contains syntax errors, and the start key is pressed to run it.

Troubleshooting:

1. Check whether the loaded program status bar on the teach pendant contains the program loading path;
2. If it contains the program loading path, check whether that program has syntax errors.

Solution:

For cause 1, load the program before pressing the start key to run it.
For cause 2, reload the program, check the syntax-error dialog, modify the program, and run it once no syntax errors remain.

Case sharing:

None.