getting error while creating sample SDK as per documentation

I am trying to create sample SDK in mendix as mention in documentation ( But i am getting error in VS as above Thank u in advance  
1 answers

Depending on which version of the SDK you are working on, load() without arguments is defined to return a Promise and should work on at least the version I am using (platformsdk 4.1.1; modelsdk 4.21.0).

load() is also overloaded with several parameter patterns of which one needs a callback.