Can't run dev

[robozb]

npm run dev

electron-react-demo@0.1.0 dev
concurrently -k "BROWSER=none npm start" "npm:electron"

[0] 'BROWSER' is not recognized as an internal or external command,
[0] operable program or batch file.
[0] BROWSER=none npm start exited with code 1
--> Sending SIGTERM to other processes..
[electron] npm run electron exited with code 1