i have oracle 9.2.0.1 on windows server 2003

i have make schedule to referesh materialized views using oracle

but when it going to refresh ,it changes state of refresh in unusable

and when i try to do it manually it gives error
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Ora-12008 error in materialized view refresh path
ora-01114 io error writing block to file 201(block #2621321)
ora-27069 skgfdisp:attmempt to do i/o beyond the range of file
osd-04026 invalid parameter passed(OS 2621327)
ora-01114 io error writing block to file 201(block#2621321)
ora-27069 skgfdisp:attempt do i/o beyond the range of the file
osd-04026 invalid parameter passed (OS 2621327)
ora 06512 at "SYS.DBMS_SNAPSHOt",line 794
ora 06512 at "SYS.DBMS_SNAPSHOt", line 851
ora 06512 at "SYS.DBMS_SNAPSHOt", line 832
ora 06512 at line 2

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another thing i want to say when i restart my server and try to refresh manually it can refresh
but after day
when turn comes to refersh automatically gives same error
please help me