# PCSDK ReadUIInstruction() fails

**URL:** <https://tech-community.robotics.abb.com/t/pcsdk-readuiinstruction-fails/6245>\
**Category:** RobotStudio\
**Tags:** readuiinstruction, pcdsk\
**Created:** [July 29, 2014, 5:12pm UTC](https://tech-community.robotics.abb.com/t/pcsdk-readuiinstruction-fails/6245 "2014-07-29T17:12:33Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![DanS](https://avatars.discourse-cdn.com/v4/letter/d/7993a0/32.png) [@DanS](https://tech-community.robotics.abb.com/u/DanS)\
**Post date:** [July 29, 2014, 5:12pm UTC](https://tech-community.robotics.abb.com/t/pcsdk-readuiinstruction-fails/6245/1 "2014-07-29T17:12:33Z")

</div>

Several machines in production, all using PCSDK will eventually fault with this error:

An exception has occurred.  
Message: Attempt to access the method failed.  
Source: ABB.Robotics.Adapters.IRC5  
StackTrace: at Adapters.Rapid.ReadUIInstruction(String taskName, String stackUrl)  
at ABB.Robotics.Controllers.Internal.UIInstruction.ReadUIInstruction(String taskName, String stackUrl)  
InnerException:

An I-start will resolve the issues, but it will occur again in time. How can I go about resolving this issue? Any help/advice would be appreciated.

Thanks,  
Dan.