Flutter : How to solve [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: PlatformException(null-error, Host platform returned null value for non-null return value., null, null)

Go to android/build.gradle
and replace

classpath 'com.google.gms:google-services:4.4.0'

to

classpath 'com.google.gms:google-services:4.3.15'

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