Random build errors in Ionic2 - goes away when copy src folder to new project

I have the following issue… I have very random build errors. One it happens, they do not go away until I start a new project and copy over my src folder. This slows down productivity a lot.

Error is this:

MacBook-Pro:roomary floriannorbertbepunkt$ ionic serve

Running 'serve:before' npm script before serve

> ionic-hello-world@ watch /Users/floriannorbertbepunkt/Dropbox/Dropbox Arbeit/Mister Bishop Studios/Roomary/Data/roomary
> ionic-app-scripts watch

    throw err;

Error: Cannot find module '../dist/index'
    at Function.Module._resolveFilename (module.js:469:15)
    at Function.Module._load (module.js:417:25)
    at Module.require (module.js:497:17)
    at require (internal/module.js:20:19)
    at Object.<anonymous> (/Users/floriannorbertbepunkt/Dropbox/Dropbox Arbeit/Mister Bishop Studios/Roomary/Data/roomary/node_modules/.bin/ionic-app-scripts:19:3)
    at Module._compile (module.js:570:32)
    at Object.Module._extensions..js (module.js:579:10)
    at Module.load (module.js:487:32)
    at tryModuleLoad (module.js:446:12)
    at Function.Module._load (module.js:438:3)

System information:

Cordova CLI: 6.3.1
Ionic Framework Version: 2.0.0-rc.1
Ionic CLI Version: 2.1.1
Ionic App Lib Version: 2.1.1
Ionic App Scripts Version: 0.0.36
ios-deploy version: 1.9.0 
ios-sim version: 5.0.8 
OS: Mac OS X El Capitan
Node Version: v6.8.0
Xcode version: Xcode 8.0 Build version 8A218a