ERROR IN ORACLE REPORT

Dear ALL,

im trying to run a customized report on oracle ..

if i run it in one month, the output is normal & the report worked normally but if i run it on a period of 6 month the report generate this errors:

"Current NLS_LANG, NLS_NUMERIC_CHARACTERS and NLS_SORT Environment Variables are :

American_America.UTF8

'.,'

BINARY

stat_low = 86

stat_high = 0

emsg:was terminated by signal 6

Enter Password:

#

# An unexpected error has been detected by HotSpot Virtual Machine:

#

# SIGSEGV (11) at pc=d87c4c51, pid=27074, tid=16

#

# Java VM: Java HotSpot(TM) Server VM (1.4.2 1.4.2.14-070618-21:40-IA64N IA64 mixed mode)