Event ID 1000 & Event ID 1202

Recently I set up a new Domain Controller with Active Directory. Have not gotten very far to this point in finishing it’s set up, but am noticing a recurring problem that shows an event in the Application folder of Event Viewer. Error message happens every five minutes, but there seems to be no detriment to my network because of this. Nonetheless, I like to get it cleaned up. Here are the error messages:

Event ID 1000 Source: Userenv
The Group Policy client-side extension Security was passed flags (17) and returned a failure status code of (1332).

Event ID 1202 Source: SceCli
Security policies are propagated with warning. 0x534 : No mapping between account names and security IDs was done.
Please look for more details in TroubleShooting section in Security Help.

Anyone know what this is all about and how to fix?

Thanks in advance.