error webpack

C:\Users\Jareth\AppData\Roaming\npm\node_modules\webpack\node_modules\webpack-core\lib\LoadersList.js:7
        this.list.forEach(function(element) {
                  ^

TypeError: this.list.forEach is not a function
    at new LoadersList (C:\Users\Jareth\AppData\Roaming\npm\node_modules\webpack\node_modules\webpack-core\lib\LoadersList.js:7:12)
    at new NormalModuleFactory (C:\Users\Jareth\AppData\Roaming\npm\node_modules\webpack\lib\NormalModuleFactory.js:16:17)
    at Compiler.createNormalModuleFactory (C:\Users\Jareth\AppData\Roaming\npm\node_modules\webpack\lib\Compiler.js:369:28)
    at Compiler.newCompilationParams (C:\Users\Jareth\AppData\Roaming\npm\node_modules\webpack\lib\Compiler.js:382:29)
    at Compiler.compile (C:\Users\Jareth\AppData\Roaming\npm\node_modules\webpack\lib\Compiler.js:389:20)
    at Watching.<anonymous> (C:\Users\Jareth\AppData\Roaming\npm\node_modules\webpack\lib\Compiler.js:46:17)
    at Compiler.applyPluginsAsync (C:\Users\Jareth\AppData\Roaming\npm\node_modules\webpack\node_modules\tapable\lib\Tapable.js:60:69)
    at Watching._go (C:\Users\Jareth\AppData\Roaming\npm\node_modules\webpack\lib\Compiler.js:44:16)
    at Watching.<anonymous> (C:\Users\Jareth\AppData\Roaming\npm\node_modules\webpack\lib\Compiler.js:36:8)
    at Compiler.readRecords (C:\Users\Jareth\AppData\Roaming\npm\node_modules\webpack\lib\Compiler.js:302:10)
    at new Watching (C:\Users\Jareth\AppData\Roaming\npm\node_modules\webpack\lib\Compiler.js:33:16)
    at Compiler.watch (C:\Users\Jareth\AppData\Roaming\npm\node_modules\webpack\lib\Compiler.js:161:17)
    at processOptions (C:\Users\Jareth\AppData\Roaming\npm\node_modules\webpack\bin\webpack.js:186:12)
    at Object.<anonymous> (C:\Users\Jareth\AppData\Roaming\npm\node_modules\webpack\bin\webpack.js:192:1)
    at Module._compile (module.js:413:34)
    at Object.Module._extensions..js (module.js:422:10)
    at Module.load (module.js:357:32)
    at Function.Module._load (module.js:314:12)
    at Function.Module.runMain (module.js:447:10)
    at startup (node.js:139:18)
    at node.js:999:3