This webpack config seems to be configured correctly because running the CLI webpack-dev-server is successful. However when using the gulp example from the webpack docs: I can't seem to successfully invoke the webpack dev server. What is going on?
$ npm install
$ gulp
[10:35:59] Using gulpfile ~/webpack-dev-server-grief/gulpfile.js
[10:35:59] Starting 'default'...
[10:35:59] Finished 'default' after 49 ms
[10:35:59] [webpack-dev-server] http://localhost:8080/index.html
/home/vincent/webpack-dev-server-grief/node_modules/webpack/node_modules/webpack-core/lib/NormalModuleMixin.js:161
if(isError) throw e;
^
Error: Invalid path
at pathToArray (/home/vincent/webpack-dev-server-grief/node_modules/webpack-dev-server/node_modules/webpack-dev-middleware/node_modules/memory-fs/lib/MemoryFileSystem.js:23:38)
at MemoryFileSystem.mkdirpSync (/home/vincent/webpack-dev-server-grief/node_modules/webpack-dev-server/node_modules/webpack-dev-middleware/node_modules/memory-fs/lib/MemoryFileSystem.js:107:13)
at MemoryFileSystem.(anonymous function) [as mkdirp] (/home/vincent/webpack-dev-server-grief/node_modules/webpack-dev-server/node_modules/webpack-dev-middleware/node_modules/memory-fs/lib/MemoryFileSystem.js:187:34)
at Tapable.<anonymous> (/home/vincent/webpack-dev-server-grief/node_modules/webpack/lib/Compiler.js:225:25)
at Tapable.applyPluginsAsync (/home/vincent/webpack-dev-server-grief/node_modules/webpack/node_modules/tapable/lib/Tapable.js:60:69)
at Tapable.Compiler.emitAssets (/home/vincent/webpack-dev-server-grief/node_modules/webpack/lib/Compiler.js:222:7)
at Watching.<anonymous> (/home/vincent/webpack-dev-server-grief/node_modules/webpack/lib/Compiler.js:53:18)
at /home/vincent/webpack-dev-server-grief/node_modules/webpack/lib/Compiler.js:397:12
at Tapable.next (/home/vincent/webpack-dev-server-grief/node_modules/webpack/node_modules/tapable/lib/Tapable.js:69:11)
at CachePlugin.<anonymous> (/home/vincent/webpack-dev-server-grief/node_modules/webpack/lib/CachePlugin.js:40:4)