While installing twofi, it makes error...

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http://www.backtrack-linux.org – Code: root@bt:~# apt-get install twofi Reading package lists... Done Building dependency tree      Reading state information... Done twofi is already the newest version. 0 upgraded, 0 newly installed, 0 to remove and 97 not upgraded. 1 not fully installed or removed. After this operation, 0B of additional disk space will be used. Setting up twofi (1.0-bt0) ... Building native extensions.  This could take a while... ERROR:  Error installing json:         ERROR: Failed to build gem native extension. /usr/bin/ruby1.9.2 extconf.rb (HowTos)