Crawl error SharePoint 2013 - Processing this item failed because of an unknown error when trying to parse its contents.

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During various search troubleshooting i came across the following crawling error in the Craw log of a SharePoint 2013 environment.

Processing this item failed because of an unknown error when trying to parse its contents. (Error parsing document 'https://sharepoint.contoso.com/Project/abcd/Q_M/ABX/SitePages/Homepage.aspx'. Sandbox worker pool is
closed.; ; SearchID = 820E86ZD-5252-4G5F-AK9U-2096ZV3L56PP )

In order to fix this you can try to perform the following action plan:

Open "Local Policies”

Click on “User rights assignment”

Make sure that the search service account has the following rights:

"Replace a process level token”

 

"Adjust memory quotas for a process"

"Impersonate a client after authentication"

 

Please make sure that the policies don't get changed afterwards.

After implementing the above changes please run a clear configuration cache as explained here: https://blogs.msdn.com/b/josrod/archive/2007/12/12/clear-the-sharepoint-configuration-cache-for-timer-job-and-psconfig-errors.aspx 

After clearing the cache, start a full crawl and the errors should be gone.