Error: "The following group policies could not be compared due to a snapshot reading error".

change summary group policy error report
KB1301 | Last review: Aug 14, 2017 | Netwrix Auditor for Active Directory | 5.0 and above
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Symptoms The Change Summary emails contain the following error message:
'The following group policies could not be compared due to a snapshot reading error"

 
Cause Netwrix Auditor uses native Windows tools like Microsoft Group Policy Management console during the data collection. When an issue appears in there it automatically shows up in Netwrix Auditor reports too.
For example, some Group Policy objects can have incorrect structure and cannot not processed.
 
To make sure that this issue relates to Group Policy objects themselves perform following steps:
  1. Select Start -> Run and type  gpmc.msc on the computer where Netwrix Auditor resides.
  2. Find there any problematic GPO that displayed in report.
  3. Switch to Settings tab, right-click and select  Save Report.
  4. Error should occur during this process.
Resolution To troubleshoot this issue, please open problematic GPOs in Microsoft Group Policy Management console, review their settings and fix the errors.
In some cases it is not possible to fix these incorrect GPOs and it is recommended to recreate them. 
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