# Cant even open ComfyUI without ERROR Exit code -999

**URL:** <https://forum.comfy.org/t/cant-even-open-comfyui-without-error-exit-code-999/4053>\
**Category:** Windows\
**Tags:** issue, starting-comfyui\
**Created:** [December 15, 2025, 10:34am UTC](https://forum.comfy.org/t/cant-even-open-comfyui-without-error-exit-code-999/4053 "2025-12-15T10:34:40Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Onelasstgo](https://avatars.discourse-cdn.com/v4/letter/o/71c47a/32.png) [@Onelasstgo](https://forum.comfy.org/u/Onelasstgo)\
**Post date:** [December 15, 2025, 10:34am UTC](https://forum.comfy.org/t/cant-even-open-comfyui-without-error-exit-code-999/4053/1 "2025-12-15T10:34:40Z")

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![image](https://canada1.discourse-cdn.com/flex009/uploads/comfyui1/original/1X/b9b7f5b518dc6f010212a58cf0c9b84f9f59157a.png)  
Any ideas? Was really stoked to try this out