Error installing Android NDK

[bdovaz]

Issue Checklist

• [x] I'm using the latest u3d version
• [x] I ran u3d --help
• [x] I read the README
• [x] I made sure that a similar issue doesn't exit

Issue Description

I get the following error:

undefined method `root_path' for nil:NilClass (NoMethodError)

C:\WINDOWS\system32>u3d install 2019.4.0f1 -p Unity,Android-ndk --installation_path "D:\Unity\Unity_2019.4.0f1" --trace
Root privileges are requirednity 2019.4.0f1 is already downloaded
Android NDK is already downloaded
-------------------------------------------
--- Installing Unity 2019.4.0f1 (Unity) ---
-------------------------------------------
Installing with C:/Users/jenkins/Downloads/Unity_Packages/2019.4.0f1/UnitySetup64.exe
$ C:/Users/jenkins/Downloads/Unity_Packages/2019.4.0f1/UnitySetup64.exe -UI=reduced /S /D=D:\Unity\Unity_2019.4.0f1
No pty implementation found. Falling back to popen. Output might be buffered
Successfully installed Unity 2019.4.0f1
--------------------------------------------
--- Installing Android NDK (Android-ndk) ---
--------------------------------------------
Installing with C:/Users/jenkins/Downloads/Unity_Packages/2019.4.0f1/android-ndk-r19-windows-x86_64.zip
Traceback (most recent call last):
        16: from C:/tools/ruby27/bin/u3d:23:in `<main>'
        15: from C:/tools/ruby27/bin/u3d:23:in `load'
        14: from C:/tools/ruby27/lib/ruby/gems/2.7.0/gems/u3d-1.2.3/exe/u3d:7:in `<top (required)>'
        13: from C:/tools/ruby27/lib/ruby/gems/2.7.0/gems/u3d-1.2.3/lib/u3d/commands_generator.rb:41:in `start'
        12: from C:/tools/ruby27/lib/ruby/gems/2.7.0/gems/u3d-1.2.3/lib/u3d/commands_generator.rb:263:in `run'
        11: from C:/tools/ruby27/lib/ruby/gems/2.7.0/gems/commander-4.5.0/lib/commander/delegates.rb:15:in `run!'
        10: from C:/tools/ruby27/lib/ruby/gems/2.7.0/gems/commander-4.5.0/lib/commander/runner.rb:68:in `run!'
         9: from C:/tools/ruby27/lib/ruby/gems/2.7.0/gems/commander-4.5.0/lib/commander/runner.rb:446:in `run_active_command'
         8: from C:/tools/ruby27/lib/ruby/gems/2.7.0/gems/commander-4.5.0/lib/commander/command.rb:153:in `run'
         7: from C:/tools/ruby27/lib/ruby/gems/2.7.0/gems/commander-4.5.0/lib/commander/command.rb:182:in `call'
         6: from C:/tools/ruby27/lib/ruby/gems/2.7.0/gems/u3d-1.2.3/lib/u3d/commands_generator.rb:176:in `block (2 levels) in run'
         5: from C:/tools/ruby27/lib/ruby/gems/2.7.0/gems/u3d-1.2.3/lib/u3d/commands.rb:169:in `install'
         4: from C:/tools/ruby27/lib/ruby/gems/2.7.0/gems/u3d-1.2.3/lib/u3d/installer.rb:58:in `install_modules'
         3: from C:/tools/ruby27/lib/ruby/gems/2.7.0/gems/u3d-1.2.3/lib/u3d/installer.rb:58:in `each'
         2: from C:/tools/ruby27/lib/ruby/gems/2.7.0/gems/u3d-1.2.3/lib/u3d/installer.rb:61:in `block in install_modules'
         1: from C:/tools/ruby27/lib/ruby/gems/2.7.0/gems/u3d-1.2.3/lib/u3d/installer.rb:477:in `install'
C:/tools/ruby27/lib/ruby/gems/2.7.0/gems/u3d-1.2.3/lib/u3d/installer.rb:108:in `install_zip': undefined method `root_path' for nil:NilClass (NoMethodError)