ISIS error

Hi,

I have isis-1.4.7 and headas-6.1.1 installed in my pc with a FC4 
operating system. The environment for isis in the .cshrc file is :   
setenv ISIS_SRCDIR /data/kuntal/isis-1.4.7/.

The initial commands run ok in isis but when i start the model fitting 
with the command

fit_fun 
("constant(Isis_Active_Dataset)*(phabs(1)*zphabs(1)*zredden(1)*powerlaw(1))");

it gives an error:
Error linking to /data/kuntal/isis-1.4.7//lib/modules/xspec-module.so: 
libxspec_lfn_6.2.so: cannot open shared object file: No such file or 
directory
/data/kuntal/isis-1.4.7//share/xspec.sl:27:<top-level>:Import Error 1

I am unable to resolve this. Please give your suggestions for the same.

Regards,
--Kuntal
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