Oracle : Use two different versions of EXP on the same machine ?

Question

Hi,

i have a server (HP-UX) installed with Oracle 10g and several databases on it.

I've been asked to make dumps from these tables for a Oracle 8i database. In order to do this, i need to use the 8i version of the EXP (export) tool of Oracle.

It is still installed on my server but when i want to use it, i get the following error :

EXP-00056: ORACLE error 12705 encountered ORA-12705: Cannot access NLS data files or invalid environment specified

I presume some files are missing or maybe one of the folder is not in the PATH but i can't find and i really don't want to break the 10g installation.

Someone knows how to do ?

Thanks