The Microsoft Jet database engine stopped the process because you and another user are attempting to change the same data at the same time.
Use Microsoft Access to open the catalog.mdb file in the source catalog.
Use the Compact & Repair tool in Microsoft Access.
Export the source catalog.
Try importing the new .CTLG file.
The above process worked for one user. It may be necessary to Compact & Repair the destination database in other cases.