gatsby: default starter throws sharp errors

Description

when creating a new site with the default starter, an error is immediately thrown before any code changes are made

Steps to reproduce

1. create a new site with the default starter (gatsby new mysite)
2. start it (npm run develop)

Expected result

starter site should start with no errors

Actual result

errors

Environment

  System:
    OS: macOS Mojave 10.14.6
    CPU: (8) x64 Intel(R) Core(TM) i7-7820HQ CPU @ 2.90GHz
    Shell: 3.2.57 - /bin/bash
  Binaries:
    Node: 12.13.0 - ~/.nvm/versions/node/v12.13.0/bin/node
    Yarn: 1.22.4 - /usr/local/bin/yarn
    npm: 6.13.7 - ~/.nvm/versions/node/v12.13.0/bin/npm
  Languages:
    Python: 2.7.17 - /usr/local/bin/python
  Browsers:
    Chrome: 80.0.3987.132
    Firefox: 71.0
    Safari: 13.0.5
  npmPackages:
    gatsby: ^2.19.43 => 2.19.43 
    gatsby-image: ^2.2.43 => 2.2.43 
    gatsby-plugin-manifest: ^2.2.47 => 2.2.47 
    gatsby-plugin-offline: ^3.0.40 => 3.0.40 
    gatsby-plugin-react-helmet: ^3.1.23 => 3.1.23 
    gatsby-plugin-sharp: ^2.4.12 => 2.4.12 
    gatsby-source-filesystem: ^2.1.55 => 2.1.55 
    gatsby-source-graphql: ^2.1.34 => 2.1.34 
    gatsby-transformer-sharp: ^2.3.18 => 2.3.18