Could not find method create() for arguments [crashlyticsStoreDeobsDebug, class com.crashlytics.tools.gradle.tasks.StoreMappingFileTask, com.android.build.gradle.int
For me, the problem appeared when I updated to AS 3.2-RC02 which requires the Android plugin 3.2.0-rc02.
So I had to roll back to AS 3.1.4 which is the current stable version so I could downgrade my version of the Android plugin. I am using Android plugin 3.2.0-rc01
I also had to downgrade the fabric plugin to 1.24.4