Error Synchronizing Slave

Hey All,

I am getting this pop-up after trying to synch the slave with the master:

"MDM repository data is out-of-date or is locked by another MDM Server. Refresh the data and try the operation again. If the error persists, contact the system admin."

Currently I have stopped both the master and slave server, kicked off everyone connected to it, verified the master/slave connection. Any ideas for me?

Thanks.