Browser deployment get initial datas from REST API

[mate1213]

Hello,
I've stuck with this problem quite a while ago.
I've trying to load data from REST API when the application is start.
With the example provided in the documentation, works on every platform deployment (Win, Linux, IOS, OSX, Android) but not on browser. (Example: https://docs.avaloniaui.net/docs/0.10.x/tutorials/music-store-app/load-data-at-startup)
When I run this in the browser, the following error happens:

If I not use the RxApp.MainThreadScheduler.Schedule(LoadInitialData); call, but directly call up the LoadInitialData().Wait() function in the ctor (<- I know this is not the proper way, any suggestion welcomed ) The application behave the same way.

Thanks for any suggestion how to sole this issue.