# Installing VisuaRuby isnt' a gem error **URL:** \ **Category:** Ruby-Gnome 2\ **Created:** [March 18, 2013, 5:22pm UTC](https://www.ruby-forum.com/t/installing-visuaruby-isnt-a-gem-error/227513 "2013-03-18T17:22:06Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![chas](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/8c91f0/32.png) [@chas](https://www.ruby-forum.com/u/chas)\ **Post date:** [March 18, 2013, 5:22pm UTC](https://www.ruby-forum.com/t/installing-visuaruby-isnt-a-gem-error/227513/1 "2013-03-18T17:22:06Z")
I am also trying to install on CentOS for which I have used RVM to setup my rubies etc when I try to install VR i.e. gem install visualruby I get the following: gem install visualruby [/home/charles/.rvm/gems/ruby-1.9.3-p392/specifications/pango-1.2.2.gemspec] isn’t a Gem::Specification (NilClass instead). [/home/charles/.rvm/gems/ruby-1.9.3-p392/specifications/gdk\_pixbuf2-1.2.2.gemspec] isn’t a Gem::Specification (NilClass instead). [/home/charles/.rvm/gems/ruby-1.9.3-p392/specifications/cairo-1.12.4.gemspec] isn’t a Gem::Specification (NilClass instead). [/home/charles/.rvm/gems/ruby-1.9.3-p392/specifications/atk-1.2.2.gemspec] isn’t a Gem::Specification (NilClass instead). [/home/charles/.rvm/gems/ruby-1.9.3-p392/specifications/glib2-1.2.2.gemspec] isn’t a Gem::Specification (NilClass instead). [/home/charles/.rvm/gems/ruby-1.9.3-p392/specifications/pango-1.2.2.gemspec] isn’t a Gem::Specification (NilClass instead). [/home/charles/.rvm/gems/ruby-1.9.3-p392/specifications/gdk\_pixbuf2-1.2.2.gemspec] isn’t a Gem::Specification (NilClass instead). [/home/charles/.rvm/gems/ruby-1.9.3-p392/specifications/cairo-1.12.4.gemspec] isn’t a Gem::Specification (NilClass instead). [/home/charles/.rvm/gems/ruby-1.9.3-p392/specifications/atk-1.2.2.gemspec] isn’t a Gem::Specification (NilClass instead). [/home/charles/.rvm/gems/ruby-1.9.3-p392/specifications/glib2-1.2.2.gemspec] isn’t a Gem::Specification (NilClass instead). ERROR: While executing gem … (NoMethodError) undefined method `spec’ for nil:NilClass ---
**Author:** ![chas](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/8c91f0/32.png) [@chas](https://www.ruby-forum.com/u/chas)\ **Post date:** [March 19, 2013, 3:06am UTC](https://www.ruby-forum.com/t/installing-visuaruby-isnt-a-gem-error/227513/2 "2013-03-19T03:06:17Z")
On Mon, Mar 18, 2013 at 10:22 AM, Charles M. \< [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)\> wrote: > I am also trying to install on CentOS for which I have used RVM to setup What version of CentOS are you using 5 or 6? ---
**Author:** ![chas](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/8c91f0/32.png) [@chas](https://www.ruby-forum.com/u/chas)\ **Post date:** [March 19, 2013, 4:02am UTC](https://www.ruby-forum.com/t/installing-visuaruby-isnt-a-gem-error/227513/3 "2013-03-19T04:02:23Z")
On Mon, Mar 18, 2013 at 8:05 PM, Grant S. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > On Mon, Mar 18, 2013 at 10:22 AM, Charles M. \< > [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)\> wrote: > > > I am also trying to install on CentOS for which I have used RVM to setup > > What version of CentOS are you using 5 or 6? Ah, I just tried both myself, I figure you are on CentOS 6 since gtksourceview2 isn’t readily available on CentOS 5 Anyways I did quick search on the error and it sounds like your gem cache is corrupted. To find out where those run “gem env” And look the :“GEM PATHS:” section. There usually is a cache directory down each of those paths. Assuming you have write access to them, just delete the contents of the directory. Actually if you should be able to just delete whole cache directory. gem will recreate when it needs to. I’m not positive about this, but it did it fine for me. I just tested it. ---
**Author:** ![chas](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/8c91f0/32.png) [@chas](https://www.ruby-forum.com/u/chas)\ **Post date:** [March 19, 2013, 4:10am UTC](https://www.ruby-forum.com/t/installing-visuaruby-isnt-a-gem-error/227513/4 "2013-03-19T04:10:35Z")
On Mon, Mar 18, 2013 at 9:01 PM, Grant S. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > > > > > “gem env” > And look the :“GEM PATHS:” section. > > There usually is a cache directory down each of those paths. > > Assuming you have write access to them, just delete the contents of the > directory. Actually if you should be able to just delete whole cache > directory. gem will recreate when it needs to. I’m not positive about this, > but it did it fine for me. I just tested it. Oh by the way, I was able to get visualruby installed on RHEL 6.4 with no problems. I simply downloaded a new ruby-1.9.3-p392. Configured/make/installed it. Then ran “gem install visualruby” it grabbed the dependent gems with no problems. Though I also know I already had all the rpm dependencies installed. You might get hit up with a missing -devel rpm. Just go look for its mkmf.log file and it should let you know(go to end of file) Example if it fails gtksourceview2 you may see have\_package: checking for gtksourceview-2.0… -------------------- no Just install the main and devel RPM for it: yum install gtksourceview2 gtksourceview2-devel