cordova run browser is not working

cordova run browser
Warning: using prerelease version 7.0.2-dev (cordova-lib@7.0.2-dev)
shell.js: internal error
Error: ENOENT: no such file or directory, stat '/Users/steveng/repo/cordova/tests/fetchTest/platforms/browser/www'
at Error (native)
at Object.fs.statSync (fs.js:987:18)
at /Users/steveng/repo/cordova/tests/fetchTest/platforms/browser/cordova/node_modules/shelljs/src/find.js:42:12
at Array.forEach (native)
at Object._find (/Users/steveng/repo/cordova/tests/fetchTest/platforms/browser/cordova/node_modules/shelljs/src/find.js:39:9)
at Object.find (/Users/steveng/repo/cordova/tests/fetchTest/platforms/browser/cordova/node_modules/shelljs/src/common.js:186:23)
at /Users/steveng/repo/cordova/tests/fetchTest/platforms/browser/cordova/lib/build.js:42:27
at process._tickCallback (internal/process/next_tick.js:103:7)
at Module.runMain (module.js:592:11)
at run (bootstrap_node.js:394:7)

Also https://gist.github.com/alsorokin/0c586acbfd560f50a908a9916909b220