EXP-00008: ORACLE error 904 encountered

Hi All,
i am exporting data from server 11.2.0.2 to server 11.2.0.1. ( is this possible?) if yes,
while exporting its getting terminated unsuccessfully please refer the attachment for details.
ERROR:
EXP-00003: no storage definition found for segment(0, 0)
EXP-00008: ORACLE error 904 encountered
ORA-00904: "DUMMYFLAG": invalid identifier
EXP-00000: Export terminated unsuccessfully

command which i used to export
exp username/password@datasorce file=D:\DDUMPS\exp.dmp Log=D:\DDUMPS\exp.log

windows xp sp3

Any help will be appreciated.

Thanks in Advance.

Regards,
Pkatti