Developers behind node-tar package decided to change API in PATCH version
As result, they broke a lot of packages that depend on
node-tar. We have made quick release today and reverted back to previous stable version. You need to upgrade PlatformIO IDE to 2.0.0-alpha.8.
The simple way, just navigate to
USER_HOME_DIR/.atom/packages and remove
platformio-ide folder. After that, start Atom, navigate to Settings > Install and install