# Error C0040401: no connection with controller

**URL:** <https://tech-community.robotics.abb.com/t/error-c0040401-no-connection-with-controller/6045>\
**Category:** RobotStudio\
**Created:** [March 27, 2014, 9:50am UTC](https://tech-community.robotics.abb.com/t/error-c0040401-no-connection-with-controller/6045 "2014-03-27T09:50:26Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![pjxia](https://avatars.discourse-cdn.com/v4/letter/p/a5b964/32.png) [@pjxia](https://tech-community.robotics.abb.com/u/pjxia)\
**Post date:** [March 27, 2014, 9:50am UTC](https://tech-community.robotics.abb.com/t/error-c0040401-no-connection-with-controller/6045/1 "2014-03-27T09:50:26Z")

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Sorry, guys, I am new to ABB robotstudio.  
I want to use ABB IRB140 for welding. Currently I try to study RAPID programming.  
I have input all my models, including robot, tool and work piece, and then planned a short path, in the simulate module I synchronized the path to the VC already, then I can simulate the robot path, no problem.  
And now, I want to test the RAPID programming. In the controller and RAPID module, I can see the generated RAPID code, and then if I want to change the RAPID code, and start execution of the RAPID code, there is C0040401 error: no connection with controller. However, even if I do not change any RAPID code, the same error.

How to fix this problem? Is there any examples to start RAPID programming?

Thanks  
Best regards

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**Author:** ![Niklas\_Skoglund](https://avatars.discourse-cdn.com/v4/letter/n/5fc32e/32.png) [@Niklas\_Skoglund](https://tech-community.robotics.abb.com/u/Niklas_Skoglund)\
**Post date:** [April 16, 2014, 5:48pm UTC](https://tech-community.robotics.abb.com/t/error-c0040401-no-connection-with-controller/6045/2 "2014-04-16T17:48:37Z")

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Hi, you have better chances getting an answer in the main RobotStudio forum. This is for Controller SDK CTP. I can see that we have lots of posts here which are not about Controller SDK.

Before I simply help everybody by moving them over, I would like to ask you if there is something in the user interface in the forum application that would make it easier to see the difference between the different forums

:-\*