Smart Gripper calibration process

Hello again!

As edited in the other thread I managed to install the Smart Grippers AddIn.

However I seem to be unable to calibrate them. When I come to the line g_calibrate, I get the following Error Message:

The ProgramPointer stops at line 4 in my MainModule:

I imported a SmartGripper (just the Servo, Fingers Version) and linked it to my robot.

Any help, link, manual, instruction, tip is greatly appreciated!

Thanks & cheers,