ORA-00603: ORACLE server session terminated by fatal error

Hi,

When i try to import schema level, i am getting this error and import is failed. any one tell hw to fix this?
ORA-00603: ORACLE server session terminated by fatal error

Thanks

whats in the alert log

this is my alert log file

Wed May 20 03:03:12 2009
Errors in file o:\oracle\admin\aso\udump\aso_ora_1360.trc:
ORA-00603: ORACLE server session terminated by fatal error
ORA-01114: IO error writing block to file 11 (block # 1048456)
ORA-27069: skgfdisp: attempt to do I/O beyond the range of the file
OSD-04026: Invalid parameter passed. (OS 1048456)
ORA-01114: IO error writing block to file 11 (block # 1048456)
ORA-27069: skgfdisp: attempt to do I/O beyond the range of the file
OSD-04026: Invalid parameter passed. (OS 1048456)
ORA-01114: IO error writing block to file 11 (block # 1048456)
ORA-27069: skgfdisp: attempt to do I/O beyond the range of the file
OSD-04026: Invalid parameter passed. (OS 1048456)

thanks

you have IO errors, kinda like it says

best call oracle support

Thanks