Hi,
Check function group activated or not!!!!
Check DISK SPACE free or enough not.
Lastly try with SE54>utilities>total transport.
This option also good.
check sap help also
http://help.sap.com/saphelp_bw/helpdata/en/a1/e4521aa2f511d1a5630000e82deaaa/content.htm
Thanks
Gourav.