App Inventor error: package com.heyzap.sdk.ads does not exist

[tkai y0brainx6]

I have this error message.
error: package com.heyzap.sdk.ads does not exist
there are 15 of these errors.

And i don't know how to fix it.
How it is possible that com.heyzap.sdk.ads does not exist i done everything from tutorial.

PS.
compileSdkVersion 28
buildToolsVersion 28.0.3

Sorry for my bad english.

 

[Deleted User]

Sounds like you're missing a dependency in the build.gradle.
What tutorial are you following?