ruby LoadError cannot load such file

Question

When I require a file  for example  called st rb    require  rubygems  require  mongrel   class TestHandler  lt  Mongrel  HttpHandler    def process request  response      response start 200  do  head  out        head  Content-Type      text html        out write  Hello  World  n      end   end  end   in irb I get    gt  gt  require  st rb  LoadError  cannot load such file -- st rb     from  usr local lib ruby 1 9 1 rubygems custom require rb 36 in  require      from  usr local lib ruby 1 9 1 rubygems custom require rb 36 in  require      from  irb  3     from  usr local bin irb 12 in   lt main gt     I might have a clue  but it s just a guess  My ruby version install location is    usr local bin ruby and ruby 1 9 3p0  yet  ruby gems is in  usr local lib ruby 1 9 1 and it s talking about version 1 9 1  Could this possibly be the reason   Thanks   UPDATE Weird  when I type  puts RUBY VERSION  in IRB  I get this   puts RUBY VERSION 1 9 3 NoMethodError  undefined method  write  for nil NilClass     from  usr local lib ruby 1 9 1 irb rb 311 in  printf      from  usr local lib ruby 1 9 1 irb rb 311 in  output value      from  usr local lib ruby 1 9 1 irb rb 160 in  block  2 levels  in eval input      from  usr local lib ruby 1 9 1 irb rb 273 in  signal status      from  usr local lib ruby 1 9 1 irb rb 156 in  block in eval input      from  usr local lib ruby 1 9 1 irb ruby-lex rb 243 in  block  2 levels  in each top level statement      from  usr local lib ruby 1 9 1 irb ruby-lex rb 229 in  loop      from  usr local lib ruby 1 9 1 irb ruby-lex rb 229 in  block in each top level statement      from  usr local lib ruby 1 9 1 irb ruby-lex rb 228 in  catch      from  usr local lib ruby 1 9 1 irb ruby-lex rb 228 in  each top level statement      from  usr local lib ruby 1 9 1 irb rb 155 in  eval input      from  usr local lib ruby 1 9 1 irb rb 70 in  block in start      from  usr local lib ruby 1 9 1 irb rb 69 in  catch      from  usr local lib ruby 1 9 1 irb rb 69 in  start      from  usr local bin irb 12 in   lt main gt   Maybe IRB bug   gt  gt

User · Answer

The directory where st rb lives is most likely not on your load path   Assuming that st rb is located in a directory called lib relative to where you invoke irb  you can add that lib directory to the list of directories that ruby uses to load classes or modules with this       lt  lt   lib    For example  in order to call the module called  foobar   foobar rb  that lives in the lib directory  I would need to first add the lib directory to the list of load path  Here  I am just appending the lib directory to my load path   irb main  001 0 gt  require  foobar  LoadError  no such file to load -- foobar         from  usr lib ruby site ruby 1 8 rubygems custom require rb 36 in  gem original require          from  usr lib ruby site ruby 1 8 rubygems custom require rb 36 in  require          from  irb  1 irb main  002 0 gt       gt     usr lib ruby gems 1 8 gems spoon-0 0 1 lib     usr lib ruby gems 1 8 gems interactive editor-0 0 10 lib     usr lib ruby site ruby 1 8     usr lib ruby site ruby 1 8 i386-cygwin     usr lib ruby site ruby     usr lib ruby vendor ruby 1 8     usr lib ruby vendor ruby 1 8 i386-cygwin     usr lib ruby vendor ruby     usr lib ruby 1 8     usr lib ruby 1 8 i386-cygwin        irb main  004 0 gt      lt  lt   lib    gt     usr lib ruby gems 1 8 gems spoon-0 0 1 lib     usr lib ruby gems 1 8 gems interactive editor-0 0 10 lib     usr lib ruby site ruby 1 8     usr lib ruby site ruby 1 8 i386-cygwin     usr lib ruby site ruby     usr lib ruby vendor ruby 1 8     usr lib ruby vendor ruby 1 8 i386-cygwin     usr lib ruby vendor ruby     usr lib ruby 1 8     usr lib ruby 1 8 i386-cygwin         lib   irb main  005 0 gt  require  foobar    gt  true   EDIT Sorry  I completely missed the fact that you are using ruby 1 9 x  All accounts report that your current working directory has been removed from LOAD PATH for security reasons  so you will have to do something like in irb       lt  lt

User · Answer

The problem shall have solved if you specify your path   e g    require  st rb   --   require    st rb    See if your problem get solved or not

User · Answer

I just came across a similar problem  Try  require    st rb    This should do the trick

User · Answer

I created my own Gem  but I did it in a directory that is not in my load path     pwd  Users myuser projects   gem build my gem my gem gemspec   Then I ran irb and tried to load the Gem    gt  require  my gem  LoadError  cannot load such file -- my gem   I used the global variable    to inspect my load path and I realized I am using RVM  And rvm has specific directories in my load path     None of those directories included my   projects directory where I created the custom gem   So one solution is to modify the load path itself       lt  lt    Users myuser projects my gem lib    Note that the lib directory is in the path  which holds the my gem rb file which will be required in irb    gt  require  my gem     gt  true    Now if you want to install the gem in RVM path  then you would need to run     gem install my gem   But it will need to be in a repository like rubygems org     gem push my gem-0 0 0 gem Pushing gem to RubyGems org    Successfully registered gem my gem

User · Answer

For security  amp  other reasons  ruby does not by default include the current directory in the load path  You may want to check this for more details - Why does Ruby 1 9 2 remove  quot   quot  from LOAD PATH  and what  39 s the alternative

[ruby] ruby LoadError: cannot load such file

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