yarn run v1.22.4
$ yarn build dev
$ node development/build/index.js dev
running task "dev"...
Starting 'dev'...
Starting 'clean'...
Finished 'clean'
Starting 'styles:dev'...
Finished 'styles:dev'
Starting 'scripts:core:dev:background'...
Starting 'scripts:core:dev:ui'...
Starting 'scripts:core:dev:phishing-detect'...
Starting 'scripts:core:dev:contentscript'...
Starting 'static:dev'...
Starting 'manifest:dev'...
Starting 'reload'...
Finished 'reload'
events.js:174
throw er; // Unhandled 'error' event
^

Error: spawn yarn ENOENT
at Process.ChildProcess._handle.onexit (internal/child_process.js:240:19)
at onErrorNT (internal/child_process.js:415:16)
at process._tickCallback (internal/process/next_tick.js:63:19)
Emitted 'error' event at:
at Process.ChildProcess._handle.onexit (internal/child_process.js:246:12)
at onErrorNT (internal/child_process.js:415:16)
at process._tickCallback (internal/process/next_tick.js:63:19)
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.