I happen to be having this error after even having all both ruby, gem, and even chocolatey handy

[Carey99]

C:/HashiCorp/Vagrant/embedded/gems/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)`

[xgrid-muhammadniazi]

I have been stuck with this error as well. Is there anything we are missing? Anyone with any possible direction towards a solution; we would help the assist.

[sds]

Try the latest version 5.x, which was just released. We removed the ffi requirement.