EXP-00091 problem on prodcution

Hi Gurus,
I got an EXP-00091 error while taking export. My DB version is 9.0.1 on linux 7.1 .
My ENV says LANG=env_US
and when i tried to look into v$nls_parameters, its saying NLS_LANGUAGE=AMERICAN. now can i change my nls_language to ens_US or what to do?? please advice me.

Thanks in advance

If the statistics of a table are not required to include in export take the export with parameter STATISTICS=NONE.

In case, the statistics are need to be included can use STATISTICS=ESTIMATE or COMPUTE (default is Estimate).

HTH