Error in installing json 1.8.0

I am facing problem in installing the json 1.8.0 ruby gem due to which i
am unable to start my rails server.The error is shown below.

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    /home/ananyo/.rvm/rubies/ruby-2.2.2/bin/ruby extconf.rb
creating Makefile

make "DESTDIR=" clean

make "DESTDIR="
compiling generator.c
In file included from generator.c:1:0:
../fbuffer/fbuffer.h: In function ‘fbuffer_to_s’:
../fbuffer/fbuffer.h:175:47: error: macro "rb_str_new" requires 2
arguments, but only 1 given
     VALUE result = rb_str_new(FBUFFER_PAIR(fb));
../fbuffer/fbuffer.h:175:20: warning: initialization makes integer from
pointer without a cast [enabled by default]
     VALUE result = rb_str_new(FBUFFER_PAIR(fb));
make: *** [generator.o] Error 1

make failed, exit code 2

Gem files will remain installed in
/home/ananyo/.rvm/gems/ruby-2.2.2/gems/json-1.8.0 for inspection.
Results logged to
An error occurred while installing json (1.8.0), and Bundler cannot
Make sure that `gem install json -v '1.8.0'` succeeds before bundling.

How can i solve this problem?...

Googlin for that string led me to [1] which I think basically says
that json 1.8.0 is not compatible with ruby 2.2. I think the solution
is to use a later version of json or an earlier version of ruby.



Not to be "that guy" but ALWAYS google your errors...If the whole error doesn't work...try taking out everything unnncessary...such as paths...