Python packaging tools not found

I'm attempting to configure PyCharm to work with an existing Django project but encountering difficulties getting it setup.

Project setup:

• PyCharm runs on Windows 10
• Django runs on CentOS 7 within a local Vagrant VirtualBox VM (config.vm.box = "bento/centos-7.2")
• Python and all Python libraries are installed in a virtual environment (venv) within the VM

PyCharm steps I've done so far:

1. Setup Vagrant from Settings > Tools > Vagrant.
2. Enabled Django support from Settings > Languages & Frameworks > Django. Set the project root, settings, and manage script.

I'm now trying to configure the remote Python interpreter, but that step is failing.

• From Settings > Project: XYZ > Project Interpreter, I selected "Add Remote", "Vagrant", verified the Vagrant instance folder is correct, and entered the Python interpreter path for running Python within the venv on Vagrant.
• PyCharm connects to Vagrant but then displays the error: Could not load private key from "org.apache.commons.vfs2.provider.sftp.IdentityInfo@489330be".

• If I click "Save anyway", the project interpreter is listed as "[incomplete]" and none of the Python packages are displayed.

• If I click the link "Install packaging tools", I get the error: "Cannot find external tool: packaging_tool.py".

pip is correctly installed within the venv and works; however, I don't have any tool named "packaging_tool.py" installed in the venv (or anywhere in the Vagrant VM).

Is there a special package that I need to install within my venv in order to setup a remote interpreter on PyCharm? Or is there something else I need to do to get this step working? Thank you in advance for any help you can give on this!