Examples cannot be build with Nativescript 6

Hello Alex, I just booked your course on Angular Nativescript and tried to build the example app for chapter 6. Seems like it is not compatible with a recent version of Nativescript. In case I am wrong with it, please provide a description on how I can build the examples. From the app I tried to build I got errors regarding Observable imports from rxjs, that those were not found.