If I understand you correctly, you are using a web version of Telerik Platform and the advance option to use the template by cloning it from a specific repository,
while creating the project.
If this is so, there could be some mismatch to dependencies versions, which could lead to some errors.
Regarding that, you could create new NativeScript project while selecting a template from the drop-down menu -"NS v3.0 TypeScript Angular
", which will allow you using NativeScript 3.0 and you could keep working in the tutorial
In case this the problem still exists or you are following another workflow, please provide info about the exact steps you are following, while creating the app. It would also help if you send us the whole error log, which could be found in the "Error" tab located at the bottom of the screen.
Also give us info, whether you are using the companion app while deploying the app.
Thank you in advance for your cooperation.