EventTracker KB --Event Id: 1153 Source: Active Directory

Event Id	1153
Source	Active Directory
Description	Class identifier %1 (class name %2) has an invalid superclass %3. Inheritance ignored.
Event Information	According to Microsoft: EXPLANATION: The specified schema class has a superclass that is not valid. Inheritance is ignored. USER ACTION: To remove the inheritance loop, review the class references and fix the class hierarchy. The specified schema class has a superclass that is not valid. Inheritance is ignored. To remove the inheritance loop, review the class references and fix the class hierarchy.
Reference Links	Article Windows Operating System (Active Directory)

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