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react-native-firebase Crashlytics setup documentation results in an app that won't compile

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I just tried setting up a new app with Crashlytics following the docs here: https://rnfirebase.io/crashlytics/usage That went fine, but once I did the Android specific setup (https://rnfirebase.io/crashlytics/android-setup), my app would not compile. Here is the relevant error:

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring root project 'nicola'.
> Could not resolve all artifacts for configuration ':classpath'.
   > Could not resolve io.fabric.tools:gradle:1.28.1.
     Required by:
         project :
      > Could not resolve io.fabric.tools:gradle:1.28.1.
         > Could not get resource 'https://maven.fabric.io/public/io/fabric/tools/gradle/1.28.1/gradle-1.28.1.pom'.
            > Could not GET 'https://maven.fabric.io/public/io/fabric/tools/gradle/1.28.1/gradle-1.28.1.pom'.
               > Connect to maven.fabric.io:443 [maven.fabric.io/0.0.0.0, maven.fabric.io/0:0:0:0:0:0:0:0] failed: Connection refused (Connection refused)

I guess Google shut down the old fabric.io servers sooner than people expected. I did not get around to doing the iOS specific setup, but looking at the official Firebase docs, I'm guessing those are outdated too.

That's a useful answer
Without any help

I got this issue when adding

      maven {
            url 'https://maven.fabric.io/public'
      }

To the wrong block 🤦

It should in in buildscript -> repositories and NOT allprojects -> repositories