_CastError – Null check operator used on a null value

Issue I get this error when I run my flutter App. I’ve not been able to figure out why this error keeps occurring. Error: ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════ The following _CastError was thrown building RawGestureDetector-[LabeledGlobalKey#3c378](state: RawGestureDetectorState#d987a(gestures: ,

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Duplicate class com.google.common.util.concurrent.ListenableFuture found in modules guava-20.0.jar (com.google.guava:guava:20.0)

Issue When I use implementation ‘com.google.firebase:firebase-inappmessaging-display:17.2.0’ in my app/build.gradle, I get this error: Duplicate class com.google.common.util.concurrent.ListenableFuture found in modules guava-20.0.jar (com.google.guava:guava:20.0) and listenablefuture-1.0.jar (com.google.guava:listenablefuture:1.0) Go to the documentation to learn how to Fix dependency resolution errors. What I also have

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