exp and imp don't work

Hi 

I am running oracle 8.1.7.2.0 on several sun solaris 8 servers and on one 
of them I cannot use exp or imp. Typing exp results in the following 
error: 
Export: Release 8.1.7.2.0 - Production on Wed Feb 26 16:49:43 2003

(c) Copyright 2000 Oracle Corporation.  All rights reserved.


EXP-00056:
EXP-00000: Export terminated unsuccessfully

I tried searching google, my own oracle documentation of course and asked 
an experienced friend dba but no solution came up. 

The main difference between the server on which it doesn't work and the 
ones where it does work is that the one that gives me the error is part of 
a cluster (sun cluster 2.0) and the other ones are standalone. Further 
there are no obvious differences. Anybody have any idea? 

Karen. 
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