Error in Export "EXP-00091: Exporting questionable statistics  "

when i execute export on server having RAC DB R10g R2 on Linux 4 it return error , nobody has changed it's characterset .
how to fix this error, CAN THIS ERROR CAUSE BIG DESASTER TO DB IN FUTURE
C:\>exp hst/hst file='/home/oracle/expdat.dmp
About to export specified users ...
. exporting pre-schema procedural objects and actions
. exporting foreign function library names for user NRI
. exporting PUBLIC type synonyms
. exporting private type synonyms
. exporting object type definitions for user NRI
About to export NRI's objects ...
. exporting database links
. exporting sequence numbers
. exporting cluster definitions
. about to export NRI's tables via Conventional Path ...
. . exporting table TABLEA 0 rows exported
EXP-00091: Exporting questionable statistics.
. . exporting table TABLEB 0 rows exported
EXP-00091: Exporting questionable statistics.
Kindly Help be ho can i fix this error
Thanks in advance

Hello,
You wrote:
CAN THIS ERROR CAUSE BIG DESASTER TO DB IN FUTUREThe error message EXP-00091: Exporting questionable statistics just warns you that the statistics
were exported but these statistics may be not useable.
So, if you have to import these Tables, you may have to collect again the statistics of these Tables.
It's not relative to this problem but why don't you use DataPump (expdp/impdp) ?
Please find enclosed a link about DataPump, it's much more powerful than the classical export/import:
[http://download.oracle.com/docs/cd/B19306_01/server.102/b14215/dp_overview.htm#i1009203]
Best regards,
Jean-Valentin
Edited by: Lubiez Jean-Valentin on Feb 6, 2010 12:56 PM

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    Release 10.2      Release 10.1      Release 10.1           Release 10.1
    Release 10.2      Release 9.2      Release 9.2           Release 9.2
    Release 10.2      Release 9.0.1      Release 9.0.1           Release 9.0.1
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    >>EXP-00091 is still remain.. you said I have to chang ethe NLS but I am new to linux
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