The help for compiling the project isn't needed anymore. I didn't use a batch file, so that couldn't have caused it. The problem was that the Tiggzi update also updated Cordova. It would've been nice if that was reported anywhere instead of having to look for it myself.
But now the whole app layout is screwed and the REST functions don't seem to be working correctly anymore, even from the Tiggzi app tester.
It's crazy. I use all kinds of SDKs like Visual Studio (C#), Netbeans (PHP), Xcode(objective C) and Eclipse(Java) to develop apps, but Tiggzi is by far the hardest to get something to work while it should be the easiest.