# Error appear when I try use a conveyor

**URL:** <https://tech-community.robotics.abb.com/t/error-appear-when-i-try-use-a-conveyor/7933>\
**Category:** RobotStudio\
**Created:** [October 20, 2017, 8:57am UTC](https://tech-community.robotics.abb.com/t/error-appear-when-i-try-use-a-conveyor/7933 "2017-10-20T08:57:51Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![ederobo](https://avatars.discourse-cdn.com/v4/letter/e/bc8723/32.png) [@ederobo](https://tech-community.robotics.abb.com/u/ederobo)\
**Post date:** [October 20, 2017, 8:57am UTC](https://tech-community.robotics.abb.com/t/error-appear-when-i-try-use-a-conveyor/7933/1 "2017-10-20T08:57:51Z")

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Hello folks,

I am a newbie on RoboStudio. I am learning how work with this software. I have this error, please see this image:

 ![image.png](https://europe1.discourse-cdn.com/flex005/uploads/robotics1/original/1X/bafec77a75d31e9eefe87903f32d1996f932a294.png)  
How can I resolve this error?  
Thanks

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**Author:** ![ederobo](https://avatars.discourse-cdn.com/v4/letter/e/bc8723/32.png) [@ederobo](https://tech-community.robotics.abb.com/u/ederobo)\
**Post date:** [October 21, 2017, 4:37pm UTC](https://tech-community.robotics.abb.com/t/error-appear-when-i-try-use-a-conveyor/7933/2 "2017-10-21T16:37:28Z")

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Hello,

Anyone knows how can I solve this problem? Do you need more information?  
Thanks

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**Author:** ![Henrik\_Berlin](https://dub1.discourse-cdn.com/flex005/user_avatar/tech-community.robotics.abb.com/henrik_berlin/32/1011_2.png) [@Henrik\_Berlin](https://tech-community.robotics.abb.com/u/Henrik_Berlin)\
**Post date:** [January 5, 2018, 9:21am UTC](https://tech-community.robotics.abb.com/t/error-appear-when-i-try-use-a-conveyor/7933/3 "2018-01-05T09:21:16Z")

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Hard to know what the problem is just by looking at the error message. Anyway, check that the preceding motion instruction uses a fixed workobject with a fine point. Ensure also that the argument to DropWobj is the connected wobj. If it still doesn’t work, read the conveyor tracking manual very carefully.