I am getting error when I run synchronization of AD. Below is the error detail. Please suggest how can this be resolved
(2018-06-04 10:43:50.097) Error saving iamcoelab:  Error generating processes for event PostSync.
 Error executing script 'Event_PostSync'.
 Error generation process step event POSTSYNC.
 Error generating process ADS_ADSDomain_SearchandCreate_Person_PostSync.
 Error generating process step Search and Create Person for Accounts.
[System.NullReferenceException] Object reference not set to an instance of an object.
The event PostSync was triggered for 1 object(s) of type ADSDomain.