Run-time error '91'

I use Microsoft retail management system store operations V 2.01. My server went down and i continued transactions in the offline mode. When connection to the database was restored, i tried syncing the offline db to
the server but i get the following error code "Run-time error '91' object variable or with block variable not set. I tried shutting down both my server and the POS station and restarting them, still the problem persisted. Any help will be appreciated. Thanks.
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