Before SQL Server Management Studio can resume mirroring, it must verify whether a FORCE_SERVICE_ALLOW_DATA_LOSS command ...

Before SQL Server Management Studio can resume mirroring, it must verify whether a FORCE_SERVICE_ALLOW_DATA_LOSS command has forced service to server instance '{0}'. If service was forced, resuming mirroring could possibly cause a loss of committed transactions on server instance '{1}'. Management Studio must access both partners to verify whether data loss could occur.  Management Studio cannot verify this because of the following error from server instance '{2}':