# Engine Core Problem
**URL:** https://discussion.mcebuddy2x.com/t/engine-core-problem/301
**Category:** General Support / Questions
**Created:** [July 25, 2017, 5:07am UTC](https://discussion.mcebuddy2x.com/t/engine-core-problem/301 "2017-07-25T05:07:18Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@DonExum](https://discussion.mcebuddy2x.com/u/DonExum)
#### Post date: [July 25, 2017, 5:07am UTC](https://discussion.mcebuddy2x.com/t/engine-core-problem/301/1 "2017-07-25T05:07:19Z")
When I run MCEBuddy, It says to check and see if the engine is running. I stopped and restarted several times with no results. I tried reloading twice and have the same problem. I don’t know what to do next. Here is what is in the event log.
Error 24-Jul-2017 11:33 PM
Unable to complete initialization of MCEBuddy Engine Core.
Error: System.InvalidOperationException: This access control list is not in canonical form and therefore cannot be modified.
at System.Security.AccessControl.CommonAcl.ThrowIfNotCanonical()
at System.Security.AccessControl.CommonAcl.AddQualifiedAce(SecurityIdentifier sid, AceQualifier qualifier, Int32 accessMask, AceFlags flags, ObjectAceFlags objectFlags, Guid objectType, Guid inheritedObjectType)
at System.Security.AccessControl.DiscretionaryAcl.AddAccess(AccessControlType accessType, SecurityIdentifier sid, Int32 accessMask, InheritanceFlags inheritanceFlags, PropagationFlags propagationFlags)
at System.Security.AccessControl.CommonObjectSecurity.ModifyAccess(AccessControlModification modification, AccessRule rule, Boolean& modified)
at System.Security.AccessControl.CommonObjectSecurity.AddAccessRule(AccessRule rule)
at MCEBuddy.Engine.Core.CreateExposedDirectory(String dirPath)
at MCEBuddy.Engine.Core…ctor()
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### Author:  [@RBoy](https://discussion.mcebuddy2x.com/u/RBoy)
#### Post date: [July 25, 2017, 2:52pm UTC](https://discussion.mcebuddy2x.com/t/engine-core-problem/301/2 "2017-07-25T14:52:18Z")
Did you go through this troubleshooting guide? This error indicates a corrupted install with insufficient permissions.
> [@MCEBuddy FAQ - Install, Uninstall and Start Up Issues](https://discussion.mcebuddy2x.com/t/mcebuddy-solutions-to-installation-and-uninstallation-issues/24):
>
> 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…
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### Author:  [@DonExum](https://discussion.mcebuddy2x.com/u/DonExum)
#### Post date: [July 26, 2017, 6:54pm UTC](https://discussion.mcebuddy2x.com/t/engine-core-problem/301/3 "2017-07-26T18:54:15Z")
Thanks a lot. I think that solved it. Working GREAT.