Scilab Starting error...

Hello,I am trying to start Scilab in Ubuntu but I am getting following error whenever I start Scilab on Scilab console....

 loading initial environment
exec('@TOOLBOXDIR@/loader.sce');
                                !--error 241
File "@TOOLBOXDIR@/loader.sce" does not exist.
at line       2 of exec file called by :    
      exec(startupfiles(i),-1);
at line     156 of exec file called by :    
exec('SCI/etc/scilab.start',-1);;

and after some time, console hangs with this error, can't do any further work......

Please help someone......Thank you..!