# Segfault on Simulator when using LEDButton, CKSS?

**URL:** <https://forum.4ms.info/t/segfault-on-simulator-when-using-ledbutton-ckss/1153>\
**Category:** Plugin Development\
**Created:** [February 28, 2025, 9:16am UTC](https://forum.4ms.info/t/segfault-on-simulator-when-using-ledbutton-ckss/1153 "2025-02-28T09:16:38Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![etcetc](https://forum.4ms.info/letter_avatar_proxy/v4/letter/e/b38774/32.png) [@etcetc](https://forum.4ms.info/u/etcetc)\
**Post date:** [February 28, 2025, 9:16am UTC](https://forum.4ms.info/t/segfault-on-simulator-when-using-ledbutton-ckss/1153/1 "2025-02-28T09:16:38Z")

</div>

I have a strange issue - these UI objects seem to be crashing my simulator build as soon as I enter the detailed module UI view where you can assign knobs.

If I comment these out, there is no problem at all. I can see they are defined in `componentlibrary.hpp` of metamodule-rack-interface though?

```auto
addParam(createParam<LEDButton>(Vec(31, 192), module, BPMLFO::QUANTIZE_PHASE_PARAM));
addParam(createParam<CKSS>(Vec(8, 262), module, BPMLFO::CLOCK_MODE_PARAM));

```