The wizard could not complete

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What does this means and how to fix this?

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The wizard could not complete. Click Finish to close the wizard
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Elapsed time: 00:00:00
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Summary: 1 item(s).0 succeeded, 1 failed
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Error:
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The ActiveSyncDevice exchangeserverpro.net/Company/HeadOffice/Users/Mahera.Bawa/ExchangeActiveSyncDevices/iPhone$Appl87941C1N3NS cannot be found
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Exchange Management Shell command attempted:
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Clear-ActiveSyncDevice-Identity 'exchangeserverpro.net/Company/Head Office/Users/Mahera. Bawa/ExchangeActiveSyncDevices//iPhone$Appl87941C1N3NS'
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Thanks in advance.
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