Module not found:

Pessoal boa tarde. Alguém aí recebeu o seguinte erro ao tentar rodar npm start?

ERROR in multi (webpack)-dev-server/client?http://localhost:8080 ./app-src/app.js
Module not found: Error: Can't resolve '/Users/ttrmoreira/Dropbox/DocumentosThiago/' in '/Users/ttrmoreira/Dropbox/DocumentosThiago/!Thiago/workspace/alura/projeto-webpack/client'
 @ multi (webpack)-dev-server/client?http://localhost:8080 ./app-src/app.js
webpack: Failed to compile.

Segue o meu package.json

{
  "name": "client",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "build-dev": "webpack --config webpack.config.js",
    "build-prod": "cross-env NODE_ENV=production webpack --config webpack.config.js",
    "start": "webpack-dev-server"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "reflect-metadata": "^0.1.10"
  },
  "devDependencies": {
    "babel-core": "^6.25.0",
    "babel-loader": "^7.1.0",
    "babel-plugin-transform-decorators-legacy": "^1.3.4",
    "babel-preset-es2017": "^6.24.1",
    "babili-webpack-plugin": "^0.1.1",
    "cross-env": "^5.0.1",
    "webpack": "^3.1.0",
    "webpack-dev-server": "^2.5.1"
  }
}

e meu webpack.config.js:

const path = require('path');
const babiliPlugin = require('babili-webpack-plugin');

let plugins = [];

if(process.env.NODE_ENV == 'production'){
    plugins.push(new babiliPlugin());
}
module.exports = {
    entry: './app-src/app.js',
    output: {
        filename: 'bundle.js',
        path: path.resolve(__dirname,'dist')
    },
    module: {
        rules:[
            {
                test: /\.js$/,
                exclude: /node_modules/,
                use: {
                    loader: 'babel-loader'
                }
            }
        ]
    },
    plugins
}