Useful or not, from you.
platformio-vscode-ide Start PIO Home Server - not loading, not build project

VSCode: 1.39.2 PIO IDE: v1.9.0 System: Darwin, 17.7.0, x64

Error: Error: Detected unknown package 'contrib-pysite'

    at /Users/psh/.vscode/extensions/platformio.platformio-ide-1.9.0/node_modules/platformio-node-helpers/dist/webpack:/platformio-node-helpers/src/home.js:204:28
    at ChildProcess.h (/Users/psh/.vscode/extensions/platformio.platformio-ide-1.9.0/node_modules/platformio-node-helpers/dist/webpack:/platformio-node-helpers/src/misc.js:188:5)
    at ChildProcess.emit (events.js:182:13)
    at maybeClose (internal/child_process.js:962:16)
    at Process.ChildProcess._handle.onexit (internal/child_process.js:251:5)

CorePackageManager: Installing tool-scons @ ~3.30101.0 Error: Detected unknown package 'tool-scons'

That's a useful answer
Without any help

python --version Python 2.7.16

python3 --version Python 3.8.0a2

remove folder ~/.platformio

pio version 1.9.2

PIO HOME also does not load :(