base_ReliefF.rb:13:in `<module:FSelector>': uninitialized constant FSelector::Base (NameError)

[AmirHooshangi]

I just installed fselector-1.4.0 on a Debian OS and ruby 2.5.5p157. When I want to run the sample program on the project's wiki page, I get the following error, any help would be appreciated:

Traceback (most recent call last):
10: from gse-fselector.rb:1:in `<main>'
9: from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:39:in `require'
8: from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:135:in `rescue in require'
7: from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:135:in `require'
6: from /var/lib/gems/2.5.0/gems/fselector-1.4.0/lib/fselector.rb:37:in `<top (required)>'
5: from /var/lib/gems/2.5.0/gems/fselector-1.4.0/lib/fselector.rb:37:in `each'
4: from /var/lib/gems/2.5.0/gems/fselector-1.4.0/lib/fselector.rb:38:in `block in <top (required)>'
3: from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
2: from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
1: from /var/lib/gems/2.5.0/gems/fselector-1.4.0/lib/fselector/algo_base/base_ReliefF.rb:4:in `<top (required)>'
/var/lib/gems/2.5.0/gems/fselector-1.4.0/lib/fselector/algo_base/base_ReliefF.rb:13:in `<module:FSelector>': uninitialized constant FSelector::Base (NameError)