lerna: lerna bootstrap fails with "-4058"

I’m trying to build Jest, and Lerna is failing:

> @ postinstall C:\src\jest
> node ./scripts/postinstall.js && node ./scripts/build.js

Setting up Jest's development environment...
-> running: C:\src\jest\node_modules\.bin\lerna.cmd bootstrap cwd: C:\src\jest
Lerna v2.0.0-beta.20
Linking all dependencies
babel-plugin-jest-hoist
Errored while running BootstrapCommand.execute
-4058
-> failed running: C:\src\jest\node_modules\.bin\lerna.cmd bootstrap

Windows 10, node v4.4.3, npm v2.15.1, Lerna v2.0.0-beta.20