[SOGo] Compile error

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Hello

I am getting the following error on compiling from source:

Creating SOGo.framework/Versions/5/Headers/SOGoSAML2Session.h...
Creating SOGoSAML2Exceptions.h...          
/bin/sh: 1: ./gen-saml2-exceptions.py: not found                                
                                 
make[3]: *** [GNUmakefile:210: SOGoSAML2Exceptions.h] Error 127                 
            
make[2]: *** [/usr/share/GNUstep/Makefiles/Master/rules.make:297: 
SOGo.build-headers.framework.variables] Error 2                                 
   
make[1]: *** 
[/usr/share/GNUstep/Makefiles/Master/serial-subdirectories.make:53: 
internal-all] Error 2                                               
make: *** [/usr/share/GNUstep/Makefiles/Master/serial-subdirectories.make:53: 
internal-all] Error 2


any help would be appreciated.

Thanks
Ck