VVV: Error on re-provision: chmod on /srv/www/my_site/.git/config.lock failed

Expected Behavior

I am trying to add a new site to VVV.

Current Behavior

To add my new site, I first added the following entry to vvv-custom.yml:

  feedxl:
    repo: https://github.com/Varying-Vagrant-Vagrants/custom-site-template.git
    hosts:
      - feedxl.test

I then executed vagrant up --provision. During that process, when it came time to bring up my new site, it failed with the error:

    default: Downloading feedxl, see https://github.com/Varying-Vagrant-Vagrants/custom-site-template.git
    default: error: chmod on /srv/www/feedxl/.git/config.lock failed: Operation not permitted
    default: fatal: could not set 'core.filemode' to 'false'
    default: Error: The /srv/www/feedxl folder does not exist, and no repo was specified in the config file, there is nothing to provision for this site!

Possible Solution

I tried inspecting my VVV root directory. Inside that directory, the www folder was marked ‘read only.’ So I removed that designation. But the error still remained.

Steps to Reproduce (for bugs)

1. Add new site code to vvv-custom.yml.
2. Run vagrant up --provision.

Here is a link to more lines of the output. FYI it is not the full output. I can link that if you want.

Your Environment

• VVV version: 2.6.0-4-g678d59b
• VVV Git Branch: develop
• Vagrant version: 2.2.4
• VM Provider name: VirtualBox
• VM Provider version: Version 6.0.6 r130049 (Qt5.6.2)
• Operating System and version: Win 10, x64