Secure Mail - Unable to sync emails - Log Error: Caught ParserException in with Sync

Emails do not sync. Reinstalling Secure Mail does not resolve the issue. Secure Mail logs show: " 2019-07-16T10:40:23.024-0700 ",SecureMail,ERROR 2,-ActiveSyncEngine postSynchronousCommandWithData:contentType:withParser:withCommandString:withTimeout:error:,"Caught ParserException in with...