# MCEBuddy engine not starting

**URL:** https://discussion.mcebuddy2x.com/t/mcebuddy-engine-not-starting/2970
**Category:** General Support / Questions
**Created:** [July 18, 2019, 8:31pm UTC](https://discussion.mcebuddy2x.com/t/mcebuddy-engine-not-starting/2970 "2019-07-18T20:31:37Z")
**Posts on this page:** 1
**Showing post:** 3

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### Author: ![Goose](https://discussion.mcebuddy2x.com/letter_avatar_proxy/v4/letter/g/5f9b8f/32.png) [@Goose](https://discussion.mcebuddy2x.com/u/Goose)
#### Post date: [July 19, 2019, 4:55pm UTC](https://discussion.mcebuddy2x.com/t/mcebuddy-engine-not-starting/2970/3 "2019-07-19T16:55:43Z")

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> [@mavsfan815](#):
>
> : Exception has been thrown by the target of an invocation. —\> System.InvalidOperationException: This access control list is not in canonical form and therefore cannot be modified.

Check out the #documentation topics for most issues.

> [@MCEBuddy FAQ - Install, Uninstall and Start Up Issues](https://discussion.mcebuddy2x.com/t/mcebuddy-common-install-uninstall-and-start-up-issues/24#canonical):
>
> Sometimes MCEBuddy will run into various issues while installing, uninstalling or starting the application. Listed below are some of the common error messages and resolution steps. Please make sure you DO NOT SKIP any step and ORDER is very important. ALWAYS perform a complete uninstall of the previous version of MCEBuddy before installing a new version. ALWAYS delete the previous installation of MCEBuddy (by default in the C:\Program Files\MCEBuddy2x) before installing a new version of M…

> ## MCEBuddy Engine does not start . Windows Event Viewer contains the following error → This access control list is not in canonical form and therefore cannot be modified.
> 
> **CAUSE**
> 
> > MCEBuddy wasn’t uninstalled properly and left the directory in a corrupted state.
> 
> **RESOLUTION**
> 
> > 1. Uninstall MCEBuddy
> > 2. Delete the previous installation of MCEBuddy (by default in the _C:\Program Files\MCEBuddy2x_ ) before installing a new version of MCEBuddy.
> > 3. Reinstall MCEBuddy
> > 4. If that does not work, then follow the procedures for a [clean install](https://discussion.mcebuddy2x.com/t/24)

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