# No controller error when starting program

**URL:** <https://forum.universal-robots.com/t/no-controller-error-when-starting-program/22025>\
**Category:** Report a Bug\
**Created:** [June 16, 2022, 4:22pm UTC](https://forum.universal-robots.com/t/no-controller-error-when-starting-program/22025 "2022-06-16T16:22:21Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![emil\_larsen](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.universal-robots.com/emil_larsen/32/6476_2.png) [@emil\_larsen](https://forum.universal-robots.com/u/emil_larsen)\
**Post date:** [June 16, 2022, 4:22pm UTC](https://forum.universal-robots.com/t/no-controller-error-when-starting-program/22025/1 "2022-06-16T16:22:21Z")

</div>

We experience occasionally that the UR has the “NO CONTROLLER” error when pressing play on a program in the teach pendant. The program contains an event from our own URCap. This has happened on two different robots around twice a month, when they are used every day for development.

I can provide a support file if it can help.

Steps to reproduce:  
This is an occasional bug that we cannot reproduce on purpose.

Expected Behavior:  
When pressing the play button, that the program starts as usual.

Actual Behavior:  
When pressing the play button, the UR goes to “NO CONTROLLER” state without any visible error message.

Robot Serial Number:  
20225690009

Affected Version(s):  
Polyscove version 5.11.11.1010533  
UR robot: UR16e