error on the alert log

I have an error on my alert.log and it refer to this trace file. Could someone explain to me what I need to do ???

Dump file D:\orant\rdbms80\trace\ORA00543.TRC
Wed Feb 27 18:20:02 2002
ORACLE V8.1.6.0.0 - Production vsnsta=0
vsnsql=e vsnxtr=3
Windows NT Version 4.0 Service Pack 5, CPU type 586
Oracle8i Enterprise Edition Release 8.1.6.0.0 - Production
With the Partitioning option
JServer Release 8.1.6.0.0 - Production
Windows NT Version 4.0 Service Pack 5, CPU type 586
Instance name: orcl

Redo thread mounted by this instance: 1

Oracle process number: 35

Windows thread id: 543, image: ORACLE.EXE

*** 2002-02-27 18:20:02.500
*** SESSION ID:(64.70) 2002-02-27 18:20:02.312
******** ERROR: UGA memory leak detected 59064 ********
******************************************************
HEAP DUMP heap name="session heap" desc=0x288e790c
extent sz=0x108c alt=32767 het=32767 rec=0 flg=3 opc=3
parent=300b6d58 owner=10452818 nex=0 xsz=0x2050
EXTENT 0
Chunk 31199d54 sz= 264 free " "
EXTENT 1
Chunk 287e0800 sz= 16416 free " "
EXTENT 2
Chunk 31166440 sz= 4232 free " "
EXTENT 3
Chunk 311674dc sz= 4228 free " "
EXTENT 4
Chunk 2f561edc sz= 3732 free " "
EXTENT 5
Chunk 31158590 sz= 4232 free " "
EXTENT 6
Chunk 2f565f4c sz= 2016 free " "
EXTENT 7
Chunk 2f9c9a3c sz= 8716 freeable "single buffer "
EXTENT 8
Chunk 2f9cbc5c sz= 8716 freeable "single buffer "
EXTENT 9
Chunk 2f9cde7c sz= 8716 freeable "single buffer "
EXTENT 10
Chunk 2f566740 sz= 8716 freeable "single buffer "
EXTENT 11
Chunk 2f568960 sz= 8716 freeable "single buffer "
EXTENT 12
Chunk 2f56ab80 sz= 8716 freeable "single buffer "
EXTENT 13
Chunk 298dc830 sz= 1320 free " "
Chunk 298dcd58 sz= 748 freeable "kllcqc:kllcqslt"
Chunk 298dd044 sz= 748 freeable "kllcqc:kllcqslt"
Chunk 298dd330 sz= 1416 free " "
EXTENT 14
Chunk 311496a4 sz= 4108 free " "
EXTENT 15
Chunk 311542f0 sz= 4232 free " "
EXTENT 16
Chunk 3115538c sz= 4112 perm "perm " alo=4112
Chunk 3115639c sz= 60 free " "
Chunk 311563d8 sz= 56 freeable "kllcqc:kllcq "
EXTENT 17
Chunk 2fb1027c sz= 1048 perm "perm " alo=1048
Chunk 2fb10694 sz= 3116 free " "
EXTENT 18
Chunk 2fb112d4 sz= 60 freeable "kllcqc:kllcq "
Chunk 2fb11310 sz= 56 freeable "kllcqc:kllcq "
Chunk 2fb11348 sz= 4112 free " "
EXTENT 19
Chunk 30fdf204 sz= 4228 free " "
EXTENT 20
Chunk 2fb1236c sz= 16416 free " "
EXTENT 21
Chunk 3115c830 sz= 36 free " "
Chunk 3115c854 sz= 320 freeable "kcbl_structure_"
Chunk 3115c994 sz= 3876 free " "
EXTENT 22
Chunk 30fde16c sz= 112 perm "perm " alo=112
Chunk 30fde1dc sz= 4116 free " "
EXTENT 23
Chunk 2f56cda0 sz= 13032 perm "perm " alo=13032
EXTENT 24
Chunk 3115323c sz= 4228 free " "
EXTENT 25
Chunk 31150050 sz= 256 free " "
Chunk 31150150 sz= 320 freeable "kcbl_structure_"
Chunk 31150290 sz= 3656 free " "
EXTENT 26
Chunk 3114c830 sz= 4232 free " "
EXTENT 27
Chunk 3114d8cc sz= 4228 free " "
EXTENT 28
Chunk 3114860c sz= 32 free " "
Chunk 3114862c sz= 320 freeable "kcbl_structure_"