This is a generic "Legacy Agent" Mail, Calendar, PF, FB, Transmission Agent error. Reviewing the log file further should show the true issue prior to this error.
If there is no other error just prior to the "Error 91 Object variable or With block variable not set" error, then ensure you have enabled extended logging for the affected agent.
Once extended logging is enabled, allow the agent to run for an additional 15 minutes, then review the log once more, locate the error. Locate the error just prior to this error, and search the Support KB once more.
To enable extended logging for legacy agents please see this KB:
https://support.quest.com/migration-manager-for-exchange/kb/88019
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