# Program pointer lost
**URL:** https://tech-community.robotics.abb.com/t/program-pointer-lost/3479
**Category:** RobotStudio
**Created:** [March 29, 2010, 4:00am UTC](https://tech-community.robotics.abb.com/t/program-pointer-lost/3479 "2010-03-29T04:00:51Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@system](https://tech-community.robotics.abb.com/u/system)
#### Post date: [March 29, 2010, 4:00am UTC](https://tech-community.robotics.abb.com/t/program-pointer-lost/3479/1 "2010-03-29T04:00:51Z")
hi
heres another problem.
I constructed a system with a robot and track (attached) and I would like to move the robot along the track. So I drag the base of track and teach a couple of target and got path. When Move along the path implemented, there are two error messages : Unit not active and Program pointer lost .
Anyone knows how to fix it ? Any suggestion will be appreciated.
cheers,
julian
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### Author:  [@system](https://tech-community.robotics.abb.com/u/system)
#### Post date: [March 30, 2010, 3:53am UTC](https://tech-community.robotics.abb.com/t/program-pointer-lost/3479/2 "2010-03-30T03:53:37Z")
Ok. Problems solved. ‘Move along the Path’ is working well, but there is always a error ’ Program pointer lost’ after finishing the path. Whats the problem with it? Could anyone help?
cheers,
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### Author:  [@mattdavis](https://tech-community.robotics.abb.com/u/mattdavis)
#### Post date: [March 30, 2010, 5:46am UTC](https://tech-community.robotics.abb.com/t/program-pointer-lost/3479/3 "2010-03-30T05:46:20Z")
i think thats just because robotstudio resets the program pointer in the virtual controller after it does a simulation. So not a problem to worry about.
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### Author:  [@Andraz23](https://tech-community.robotics.abb.com/u/Andraz23)
#### Post date: [July 9, 2015, 6:40am UTC](https://tech-community.robotics.abb.com/t/program-pointer-lost/3479/4 "2015-07-09T06:40:07Z")
How did you solve program pointer lost problem?
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### Author:  [@Henrik\_Berlin](https://tech-community.robotics.abb.com/u/Henrik_Berlin)
#### Post date: [July 15, 2015, 8:31am UTC](https://tech-community.robotics.abb.com/t/program-pointer-lost/3479/5 "2015-07-15T08:31:15Z")
The “Program pointer lost” event is a side-effect of the design of the ‘move along path’ function. When doing ‘move along path’ RS creates a temporary module with the paths, sets the program pointer to it, executes it, and then removes it. It is the removal step that causes the event ‘program pointer lost’. The reason is that the temporary procedure where the program pointer is located is removed.