knife node delete error

gistfile1.txt

C:\Project\nozzle-chef>knife node delete derek-nozzle -y && knife client delete
derek-nozzle -y
C:/Ruby200/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:106:in `require':
cannot load such file -- yajl/2.0/yajl (LoadError)
        from C:/Ruby200/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:106:i
n `require'
        from C:/Ruby200/lib/ruby/gems/2.0.0/gems/yajl-ruby-1.1.0-x86-mingw32/lib
/yajl/yajl.rb:2:in `<top (required)>'
        from C:/Ruby200/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:58:in
 `require'
        from C:/Ruby200/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:58:in
 `require'
        from C:/Ruby200/lib/ruby/gems/2.0.0/gems/yajl-ruby-1.1.0-x86-mingw32/lib
/yajl.rb:1:in `<top (required)>'
        from C:/Ruby200/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:58:in
 `require'
        from C:/Ruby200/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:58:in
 `require'
        from C:/Ruby200/lib/ruby/gems/2.0.0/gems/chef-11.6.0/lib/chef/json_compa
t.rb:21:in `<top (required)>'
        from C:/Ruby200/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:58:in
 `require'
        from C:/Ruby200/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:58:in
 `require'
        from C:/Ruby200/lib/ruby/gems/2.0.0/gems/chef-11.6.0/lib/chef/rest.rb:26
:in `<top (required)>'
        from C:/Ruby200/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:58:in
 `require'
        from C:/Ruby200/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:58:in
 `require'
        from C:/Ruby200/lib/ruby/gems/2.0.0/gems/chef-11.6.0/lib/chef/knife.rb:2
7:in `<top (required)>'
        from C:/Ruby200/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:58:in
 `require'
        from C:/Ruby200/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:58:in
 `require'
        from C:/Ruby200/lib/ruby/gems/2.0.0/gems/chef-11.6.0/lib/chef/applicatio
n/knife.rb:18:in `<top (required)>'
        from C:/Ruby200/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:58:in
 `require'
        from C:/Ruby200/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:58:in
 `require'
        from C:/Ruby200/lib/ruby/gems/2.0.0/gems/chef-11.6.0/bin/knife:23:in `<t
op (required)>'
        from C:/Ruby200/bin/knife:23:in `load'
        from C:/Ruby200/bin/knife:23:in `<main>'