conflicting dependencies childprocess (= 0.5.9) and childprocess (= 0.6.3)

[ashleywarner]

I have macOS 10.12.6, which i have just updated to. and when i try to install, i get the following error:

Bundler, the underlying system Vagrant uses to install plugins,
reported an error. The error is shown below. These errors are usually
caused by misconfigured plugin installations or transient network
issues. The error from Bundler is:

conflicting dependencies childprocess (= 0.5.9) and childprocess (= 0.6.3)
  Activated childprocess-0.6.3
  which does not match conflicting dependency (= 0.5.9)

  Conflicting dependency chains:
    childprocess (= 0.6.3), 0.6.3 activated

  versus:
    childprocess (= 0.5.9)

  Gems matching childprocess (= 0.5.9):
    childprocess-0.5.9```

[arvinpan]

Recently, I met the same issue after upgraded my VirtualBox and Vagrant version to the latest (5.2.6 & 2.0.1). And solve it after doing a clean install of Vagrant as well as plugins.

• uninstall vagrant
• remove .vagrant.d, Hashcrop folder (eg. C:/Hashcrop for windows), be careful about data loss!!!
• install the latest vagrant
• install this plugin and worked

FYI.