Error when running Exp

[maurice@oust.irit.fr (Pierre MAURICE)]

 In order to check the installation of Centaur-V2.0,
I try to execute the Exp interpreter.
I've got the following:

Info: prolog ( 1 ): ECRC Common Logic Programming System [sepia opium megalog] 
Info: prolog ( 1 ): Version 3.4.5, Copyright ECRC GmbH, Thu Jun 16 11:08 1994 
Info: prolog ( 1 ): [eclipse 1]:  
Info: prolog ( 1 ): yes. 
Info: prolog ( 1 ): 
[eclipse 2]: /usr/local/auto/centaur-2.0/centaur/tables/typol/run-time/prolog/sepia/handlers.sp compiled traceable 236 bytes ...
 
Info: prolog ( 1 ): /usr/local/eclipse/lib/scattered.pl compiled optimized 5016 bytes in 0.12 seconds 
Info: prolog ( 1 ): yes. 
Info: prolog ( 1 ): eval_exp$init_eval_exp$ 
Info: PSP  : tables read. 
Error: ** toplevel : undefined escape : bas 
= ()


  I need help!

Thanks