The DAG was setup some time ago, and I just started getting this error
Server01      FileShareQuorum      *FAILED*      File share witness resource 'File Share
 Witness doesn't have a file share configured. File share witness arbitration can't be performed until the file share witness share has been properly configured.
Server01      QuorumGroup      *FAILED*      Quorum resource 'Cluster Group' is not
 online on server 'Server1'. Database availability group 'DAG01' might not be reachable or may have lost redundancy. Error: 
File Share Witness : Offline
 is offline. Please verify that the Cluster service is running on the server.
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