vagrant-proxyconf failing on setting proxy for docker

I'm using vagrant with vagrant-proxyconf to configure the proxy for the vagrant box. Unfortunately on vagrant up it fails and stops upon the Step "Configuring proxy for Docker..."

The error message is C:/Users/me/.vagrant.d/gems/2.4.4/gems/vagrant-proxyconf-2.0.0/lib/vagrant-proxyconf/action/configure_docker_proxy.rb:50:in `write': No such file or directory @ rb_sysopen - /tmp/vagrant-proxyconf-docker-config.json (Errno::ENOENT)

Any idea how I could solve this? It's happening on a freshly installed Win10 laptop, so Vagrant and VirtualBox is currently the newest version.

For completeness here the outputs until the failure:

==> csbox: Running 'pre-boot' VM customizations...
==> csbox: Booting VM...
==> csbox: Waiting for machine to boot. This may take a few minutes...
csbox: SSH address: 127.0.0.1:2222
csbox: SSH username: vagrant
csbox: SSH auth method: private key
==> csbox: Machine booted and ready!
==> csbox: Configuring proxy for Apt...
==> csbox: Configuring proxy for Docker...
C:/Users/me/.vagrant.d/gems/2.4.4/gems/vagrant-proxyconf-2.0.0/lib/vagrant-proxyconf/action/configure_docker_proxy.rb:50:in `write': No such file or directory @ rb_sysopen - /tmp/vagrant-proxyconf-docker-config.json (Errno::ENOENT)