I am having this error while I try to install WATIR 7.0 Beta 3

>ruby hi.rb
<internal:C:/Ruby30/lib/ruby/3.0.0/rubygems/core_ext/kernel_require.rb>:85:in 
`require': cannot load such file -- watir (LoadError)
    from 
<internal:C:/Ruby30/lib/ruby/3.0.0/rubygems/core_ext/kernel_require.rb>:85:in 
`require'
    from hi.rb:1:in `<main>'
>Exit code: 1
>ruby hi.rb
C:/Ruby30/lib/ruby/gems/3.0.0/gems/childprocess-4.1.0/lib/childprocess/windows.rb:6:in
 
`rescue in <top (required)>': FFI is a required pre-requisite for Windows 
or posix_spawn support in the ChildProcess gem. Ensure the `ffi` gem is 
installed. If you believe this is an error, please file a bug at 
http://github.com/enkessler/childprocess/issues 
(ChildProcess::MissingFFIError)
    from 
C:/Ruby30/lib/ruby/gems/3.0.0/gems/childprocess-4.1.0/lib/childprocess/windows.rb:3:in
 
`<top (required)>'
    from 
<internal:C:/Ruby30/lib/ruby/3.0.0/rubygems/core_ext/kernel_require.rb>:85:in 
`require'
    from 
<internal:C:/Ruby30/lib/ruby/3.0.0/rubygems/core_ext/kernel_require.rb>:85:in 
`require'
    from 
C:/Ruby30/lib/ruby/gems/3.0.0/gems/childprocess-4.1.0/lib/childprocess.rb:209:in
 
`<top (required)>'
    from 
<internal:C:/Ruby30/lib/ruby/3.0.0/rubygems/core_ext/kernel_require.rb>:85:in 
`require'
    from 
<internal:C:/Ruby30/lib/ruby/3.0.0/rubygems/core_ext/kernel_require.rb>:85:in 
`require'
    from 
C:/Ruby30/lib/ruby/gems/3.0.0/gems/selenium-webdriver-4.0.0.beta4/lib/selenium/webdriver.rb:20:in
 
`<top (required)>'
    from 
<internal:C:/Ruby30/lib/ruby/3.0.0/rubygems/core_ext/kernel_require.rb>:85:in 
`require'
    from 
<internal:C:/Ruby30/lib/ruby/3.0.0/rubygems/core_ext/kernel_require.rb>:85:in 
`require'
    from 
C:/Ruby30/lib/ruby/gems/3.0.0/gems/selenium-webdriver-4.0.0.beta4/lib/selenium-webdriver.rb:20:in
 
`<top (required)>'
    from 
<internal:C:/Ruby30/lib/ruby/3.0.0/rubygems/core_ext/kernel_require.rb>:85:in 
`require'
    from 
<internal:C:/Ruby30/lib/ruby/3.0.0/rubygems/core_ext/kernel_require.rb>:85:in 
`require'
    from 
C:/Ruby30/lib/ruby/gems/3.0.0/gems/watir-7.0.0.beta4/lib/watir.rb:1:in 
`<top (required)>'
    from 
<internal:C:/Ruby30/lib/ruby/3.0.0/rubygems/core_ext/kernel_require.rb>:160:in 
`require'
    from 
<internal:C:/Ruby30/lib/ruby/3.0.0/rubygems/core_ext/kernel_require.rb>:160:in 
`rescue in require'
    from 
<internal:C:/Ruby30/lib/ruby/3.0.0/rubygems/core_ext/kernel_require.rb>:149:in 
`require'
    from hi.rb:1:in `<main>'
<internal:C:/Ruby30/lib/ruby/3.0.0/rubygems/core_ext/kernel_require.rb>:85:in 
`require': cannot load such file -- ffi (LoadError)
    from 
<internal:C:/Ruby30/lib/ruby/3.0.0/rubygems/core_ext/kernel_require.rb>:85:in 
`require'
    from 
C:/Ruby30/lib/ruby/gems/3.0.0/gems/childprocess-4.1.0/lib/childprocess/windows.rb:4:in
 
`<top (required)>'
    from 
<internal:C:/Ruby30/lib/ruby/3.0.0/rubygems/core_ext/kernel_require.rb>:85:in 
`require'
    from 
<internal:C:/Ruby30/lib/ruby/3.0.0/rubygems/core_ext/kernel_require.rb>:85:in 
`require'
    from 
C:/Ruby30/lib/ruby/gems/3.0.0/gems/childprocess-4.1.0/lib/childprocess.rb:209:in
 
`<top (required)>'
    from 
<internal:C:/Ruby30/lib/ruby/3.0.0/rubygems/core_ext/kernel_require.rb>:85:in 
`require'
    from 
<internal:C:/Ruby30/lib/ruby/3.0.0/rubygems/core_ext/kernel_require.rb>:85:in 
`require'
    from 
C:/Ruby30/lib/ruby/gems/3.0.0/gems/selenium-webdriver-4.0.0.beta4/lib/selenium/webdriver.rb:20:in
 
`<top (required)>'
    from 
<internal:C:/Ruby30/lib/ruby/3.0.0/rubygems/core_ext/kernel_require.rb>:85:in 
`require'
    from 
<internal:C:/Ruby30/lib/ruby/3.0.0/rubygems/core_ext/kernel_require.rb>:85:in 
`require'
    from 
C:/Ruby30/lib/ruby/gems/3.0.0/gems/selenium-webdriver-4.0.0.beta4/lib/selenium-webdriver.rb:20:in
 
`<top (required)>'
    from 
<internal:C:/Ruby30/lib/ruby/3.0.0/rubygems/core_ext/kernel_require.rb>:85:in 
`require'
    from 
<internal:C:/Ruby30/lib/ruby/3.0.0/rubygems/core_ext/kernel_require.rb>:85:in 
`require'
    from 
C:/Ruby30/lib/ruby/gems/3.0.0/gems/watir-7.0.0.beta4/lib/watir.rb:1:in 
`<top (required)>'
    from 
<internal:C:/Ruby30/lib/ruby/3.0.0/rubygems/core_ext/kernel_require.rb>:160:in 
`require'
    from 
<internal:C:/Ruby30/lib/ruby/3.0.0/rubygems/core_ext/kernel_require.rb>:160:in 
`rescue in require'
    from 
<internal:C:/Ruby30/lib/ruby/3.0.0/rubygems/core_ext/kernel_require.rb>:149:in 
`require'
    from hi.rb:1:in `<main>'
<internal:C:/Ruby30/lib/ruby/3.0.0/rubygems/core_ext/kernel_require.rb>:85:in 
`require': cannot load such file -- watir (LoadError)
    from 
<internal:C:/Ruby30/lib/ruby/3.0.0/rubygems/core_ext/kernel_require.rb>:85:in 
`require'
    from hi.rb:1:in `<main>'
>Exit code: 1


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