Creat you own "Cayenne App" with Thunkable (Android & IOS)

Whenever i try to run this program i get the error ( for input string: ERROR! PLEASE FILL THE GAPS!).
i also tried the program without the extension and i still get the same error.
However, when i tried to follow this tutorial

i get the error of android.os.NetworkOnMainThreadException.

Help will be appreciated.