Migrating from 2010 to 2013 - Error

Greetings,

I am getting the error below when I try to migrate users from Exchange 2010 to 2013. I am using the 2013 EAC Migration tool to select the user to migrate. 

MigrationPermanentException: The Mailbox database "Mailbox Database Name" is not the same version as the cmdlet. --> The Mailbox database "Mailbox Database Name" is not the same version as the cmdlet.

It will throw this error and then sometimes I will try again and it might complete or it might not for the same user. Any ideas?

Thanks,

Robert