Error on Server Stastics page - StatInfo->getActiveDomainsNumber() failed: devices

[elliotc]

I am getting the following error on the Server Stastics page:

ERROR: PleskFatalException
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StatInfo->getActiveDomainsNumber() failed: devices number <= 0

0: /usr/local/psa/admin/plib/class.SystemStatisticsForm.php:145
SystemStatisticsForm->assign(object of type StatInfo)
1: /usr/local/psa/admin/htdocs/server/statistics.php

I do not know how to resolve this problem so any help would be very much appreciated.

Thanks