I have a situation where copying certain pages fails but copying others dont. This is the last exception i get in the error log:
2013-02-06 15:28:41,843  ERROR EPiServer.Core.Transfer.TransferLogger: 10.5.3 Export/import error: Failed to rollback creation of ''System.ArgumentNullException: Parameter has no page setParameter name: pageLink at EPiServer.DataFactory.Delete(PageReference pageLink, Boolean forceDelete, AccessLevel access) at EPiServer.Enterprise.Transfer.PageCopyHandler.Rollback(CopyContext context, TransferLogger transferLogger)2013-02-06 15:28:41,844  ERROR EPiServer.Enterprise.Transfer.PageCopyHandler: Failed to copy pages with root '6839' to '6408'
I got that error too when I had mapping problems with the Dynamic DataStore. Did you get any error messages logged immediately before the TransferLogger entry?