Rake db migration Loaderror

[Deleted user]

when i run bundle exec rake db:migrate, i get this following error:

bundler: failed to load command: rake (/usr/local/bin/rake)
LoadError: cannot load such file -- /usr/share/rubygems-integration/all/specifications/bin/rake
/usr/local/bin/rake:23:in load' /usr/local/bin/rake:23:in<top (required)>'

I read somehwere on stackoverflow that it may be a ruby problem so i reinstalled it. now i am greeted with this error:

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

current directory: /tmp/bundler20160902-12678-1bhz5szdebug_inspector-0.0.2/gems/debug_inspector-0.0.2/ext/debug_inspector

/usr/bin/ruby2.3 -r ./siteconf20160902-12678-5es4b5.rb extconf.rb
mkmf.rb can't find header files for ruby at /usr/lib/ruby/include/ruby.h

extconf failed, exit code 1

Gem files will remain installed in /tmp/bundler20160902-12678-1bhz5szdebug_inspector-0.0.2/gems/debug_inspector-0.0.2 for inspection.
Results logged to /tmp/bundler20160902-12678-1bhz5szdebug_inspector-0.0.2/extensions/x86_64-linux/2.3.0/debug_inspector-0.0.2/gem_make.out

I tired to install debug_inspector but it gave me same error:

gem install debug_inspector -v '0.0.2'
Building native extensions. This could take a while...
ERROR: Error installing debug_inspector:
ERROR: Failed to build gem native extension.

current directory: /var/lib/gems/2.3.0/gems/debug_inspector-0.0.2/ext/debug_inspector

/usr/bin/ruby2.3 -r ./siteconf20160902-13356-18m694k.rb extconf.rb
mkmf.rb can't find header files for ruby at /usr/lib/ruby/include/ruby.h

Is there something that i may be missing?
Im running ubuntu. also i tired running same commands in root but got the same results.

[vapor99]

Same problem here with Kali. No solutions yet