I am getting compiler errors while trying to build my game to my phone

[JuliusM]

CommandInvokationFailure: Gradle build failed.
C:\Program Files\Java\jdk-9.0.4\bin\java.exe -classpath "C:\Program

Java 9 (JDK 9) support by Unity Android

Announcement: If you are using JDK 9 or JDK10 and trying to build for Android in Unity - you’re most likely to have your build failed, with message like “Unable to list target platforms” - “Error:Invalid command android”. We are working together with Google on fixing this issue - it requires fixes on Unity side, but also Android SDK tools need to be updated to be compatible with latest Java. In the meanwhile, we recommend using Java 8 (JDK 8) 64-bit. We apologize for the inconvenience caused…