# using stop servo block in MakeCode causes CPX to crash

**URL:** https://forum.makecode.com/t/using-stop-servo-block-in-makecode-causes-cpx-to-crash/28233
**Category:** Adafruit Circuit Playground Express
**Created:** [April 14, 2024, 7:38pm UTC](https://forum.makecode.com/t/using-stop-servo-block-in-makecode-causes-cpx-to-crash/28233 "2024-04-14T19:38:09Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![voltist1](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/voltist1/32/14551_2.png) [@voltist1](https://forum.makecode.com/u/voltist1)
#### Post date: [April 14, 2024, 7:38pm UTC](https://forum.makecode.com/t/using-stop-servo-block-in-makecode-causes-cpx-to-crash/28233/1 "2024-04-14T19:38:09Z")

</div>

When I use the [stop servo] block to stop a continuous servo, I get error code 90 displayed on the Neopixels. I need to reboot the CPX to get the code running again.

- **90** (`PANIC_CODAL_HARDWARE_CONFIGURATION_ERROR`): actual board hardware doesn’t match the configuration description  
Is this a known bug? As a workaround, I have been setting the speed to 0%