The Active Directory schema cache load could not convert the default security descriptor on the following schema class object. ...

The Active Directory schema cache load could not convert the default security descriptor on the following schema class object.  
  
Security descriptor:
%1  
Schema class object:
%2  
  
As a result, the schema cache load will fail.  
  
User Action  
Verify that the default security descriptor on the class is valid. If it is not valid, change it to a correct value.  
  
Additional Data  
Error value:
%3 %4
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