In case drivectrl is hanging in state ERROR try the following:

* send stop via SmartFACT++ (Control->Drive controls->Stop movement)

If this does not work:

* goto /home/fact/operation
* restart drive control dimctrl —restart DRIVE_CONTROL
* follow the command line output of drive control: follow.sh drivectrl

!!! Always remember, be patient and wait for services to boot !!!