I have issue after some smooth running. #16

I run server as normal, and in one day, it can not compile. Please help me!

WARNING in .//chokidar/lib/fsevents-handler.js
Module not found: Error: Can't resolve 'fsevents' in 'C:\Users\nguye\OneDrive\Samsung Laptop Backup\Desktop\GitHub\javascript\node_modules\chokidar\lib'
@ .//chokidar/lib/fsevents-handler.js 7:17-36
@ .//chokidar/index.js
@ .//watchpack/lib/DirectoryWatcher.js
@ .//watchpack/lib/watcherManager.js
@ .//watchpack/lib/watchpack.js
@ (webpack)/lib/node/NodeWatchFileSystem.js
@ (webpack)/lib ^.*$
@ (webpack)/lib/webpack.js
@ ./app/js/index.js
@ multi (webpack)-dev-server/client?http://localhost:3000 babel-polyfill ./app/js

WARNING in (webpack)/~/ajv/lib/compile/index.js
13:21-34 Critical dependency: the request of a dependency is an expression

WARNING in (webpack)/~/ajv/lib/async.js
96:20-33 Critical dependency: the request of a dependency is an expression

WARNING in (webpack)/~/ajv/lib/async.js
119:15-28 Critical dependency: the request of a dependency is an expression

WARNING in (webpack)/~/uglify-js/tools/node.js
24:11-32 Critical dependency: the request of a dependency is an expression

WARNING in ./~/loader-runner/lib/loadLoader.js
5:2-28 Critical dependency: the request of a dependency is an expression

ERROR in .//mkdirp/index.js
Module not found: Error: Can't resolve 'fs' in 'C:\Users\nguye\OneDrive\Samsung Laptop Backup\Desktop\GitHub\javascript\node_modules\mkdirp'
@ .//mkdirp/index.js 2:9-22
@ (webpack)/lib/node/NodeOutputFileSystem.js
@ (webpack)/lib ^.*$
@ (webpack)/lib/webpack.js
@ ./app/js/index.js
@ multi (webpack)-dev-server/client?http://localhost:3000 babel-polyfill ./app/js

ERROR in .//graceful-fs/graceful-fs.js
Module not found: Error: Can't resolve 'fs' in 'C:\Users\nguye\OneDrive\Samsung Laptop Backup\Desktop\GitHub\javascript\node_modules\graceful-fs'
@ .//graceful-fs/graceful-fs.js 1:9-22
@ ./~/enhanced-resolve/lib/NodeJsInputFileSystem.js
@ (webpack)/lib/node/NodeEnvironmentPlugin.js
@ (webpack)/lib/webpack.js
@ ./app/js/index.js
@ multi (webpack)-dev-server/client?http://localhost:3000 babel-polyfill ./app/js

ERROR in (webpack)/lib/NormalModule.js
Module not found: Error: Can't resolve 'module' in 'C:\Users\nguye\OneDrive\Samsung
Laptop Backup\Desktop\GitHub\javascript\node_modules\webpack\lib'
@ (webpack)/lib/NormalModule.js 8:21-38
@ (webpack)/lib ^.*$
@ (webpack)/lib/webpack.js
@ ./app/js/index.js
@ multi (webpack)-dev-server/client?http://localhost:3000 babel-polyfill ./app/js

ERROR in .//loader-runner/lib/LoaderRunner.js
Module not found: Error: Can't resolve 'fs' in 'C:\Users\nguye\OneDrive\Samsung Laptop Backup\Desktop\GitHub\javascript\node_modules\loader-runner\lib'
@ .//loader-runner/lib/LoaderRunner.js 5:9-22
@ (webpack)/lib/NormalModule.js
@ (webpack)/lib ^.*$
@ (webpack)/lib/webpack.js
@ ./app/js/index.js
@ multi (webpack)-dev-server/client?http://localhost:3000 babel-polyfill ./app/js

ERROR in (webpack)//uglify-js/tools/node.js
Module not found: Error: Can't resolve 'fs' in 'C:\Users\nguye\OneDrive\Samsung Laptop Backup\Desktop\GitHub\javascript\node_modules\webpack\node_modules\uglify-js\tools'
@ (webpack)//uglify-js/tools/node.js 8:9-22
@ (webpack)/lib/optimize/UglifyJsPlugin.js
@ (webpack)/lib ^.*$
@ (webpack)/lib/webpack.js
@ ./app/js/index.js
@ multi (webpack)-dev-server/client?http://localhost:3000 babel-polyfill ./app/js

ERROR in .//chokidar/index.js
Module not found: Error: Can't resolve 'fs' in 'C:\Users\nguye\OneDrive\Samsung Laptop Backup\Desktop\GitHub\javascript\node_modules\chokidar'
@ .//chokidar/index.js 3:9-22
@ .//watchpack/lib/DirectoryWatcher.js
@ .//watchpack/lib/watcherManager.js
@ ./~/watchpack/lib/watchpack.js
@ (webpack)/lib/node/NodeWatchFileSystem.js
@ (webpack)/lib ^.*$
@ (webpack)/lib/webpack.js
@ ./app/js/index.js
@ multi (webpack)-dev-server/client?http://localhost:3000 babel-polyfill ./app/js

ERROR in (webpack)/lib/node/NodeOutputFileSystem.js
Module not found: Error: Can't resolve 'fs' in 'C:\Users\nguye\OneDrive\Samsung Laptop Backup\Desktop\GitHub\javascript\node_modules\webpack\lib\node'
@ (webpack)/lib/node/NodeOutputFileSystem.js 7:11-24
@ (webpack)/lib ^.*$
@ (webpack)/lib/webpack.js
@ ./app/js/index.js
@ multi (webpack)-dev-server/client?http://localhost:3000 babel-polyfill ./app/js

ERROR in (webpack)/lib/node/NodeMainTemplateAsync.runtime.js
Module not found: Error: Can't resolve 'fs' in 'C:\Users\nguye\OneDrive\Samsung Laptop Backup\Desktop\GitHub\javascript\node_modules\webpack\lib\node'
@ (webpack)/lib/node/NodeMainTemplateAsync.runtime.js 9:2-15 25:3-16
@ (webpack)/lib ^.*$
@ (webpack)/lib/webpack.js
@ ./app/js/index.js
@ multi (webpack)-dev-server/client?http://localhost:3000 babel-polyfill ./app/js

ERROR in .//chokidar/lib/nodefs-handler.js
Module not found: Error: Can't resolve 'fs' in 'C:\Users\nguye\OneDrive\Samsung Laptop Backup\Desktop\GitHub\javascript\node_modules\chokidar\lib'
@ .//chokidar/lib/nodefs-handler.js 3:9-22
@ .//chokidar/index.js
@ .//watchpack/lib/DirectoryWatcher.js
@ .//watchpack/lib/watcherManager.js
@ .//watchpack/lib/watchpack.js
@ (webpack)/lib/node/NodeWatchFileSystem.js
@ (webpack)/lib ^.*$
@ (webpack)/lib/webpack.js
@ ./app/js/index.js
@ multi (webpack)-dev-server/client?http://localhost:3000 babel-polyfill ./app/js

ERROR in .//chokidar/lib/fsevents-handler.js
Module not found: Error: Can't resolve 'fs' in 'C:\Users\nguye\OneDrive\Samsung Laptop Backup\Desktop\GitHub\javascript\node_modules\chokidar\lib'
@ .//chokidar/lib/fsevents-handler.js 3:9-22
@ .//chokidar/index.js
@ .//watchpack/lib/DirectoryWatcher.js
@ .//watchpack/lib/watcherManager.js
@ .//watchpack/lib/watchpack.js
@ (webpack)/lib/node/NodeWatchFileSystem.js
@ (webpack)/lib ^.*$
@ (webpack)/lib/webpack.js
@ ./app/js/index.js
@ multi (webpack)-dev-server/client?http://localhost:3000 babel-polyfill ./app/js

ERROR in .//snapdragon/lib/source-maps.js
Module not found: Error: Can't resolve 'fs' in 'C:\Users\nguye\OneDrive\Samsung Laptop Backup\Desktop\GitHub\javascript\node_modules\snapdragon\lib'
@ .//snapdragon/lib/source-maps.js 3:9-22
@ .//snapdragon/lib/compiler.js
@ .//snapdragon/index.js
@ .//braces/lib/braces.js
@ .//braces/index.js
@ .//chokidar/index.js
@ .//watchpack/lib/DirectoryWatcher.js
@ .//watchpack/lib/watcherManager.js
@ .//watchpack/lib/watchpack.js
@ (webpack)/lib/node/NodeWatchFileSystem.js
@ (webpack)/lib ^.*$
@ (webpack)/lib/webpack.js
@ ./app/js/index.js
@ multi (webpack)-dev-server/client?http://localhost:3000 babel-polyfill ./app/js
Child html-webpack-plugin for "index.html":
chunk {0} index.html 576 kB [entry]
+ 4 hidden modules
webpack: Failed to compile.