What does the error message "unknown property 'ndkVersion' for object of type com.android.build.gradle.internal.dsl.BaseAppModuleExtension" mean?

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This error message typically indicates that the build.gradle file for an Android project is referencing an 'ndkVersion' property that is not recognized by the system. This property is used to specify the version of the Android NDK (Native Development Kit) to be used in the project, and it is typically defined in the defaultConfig section of the file. Common causes of this error include typos in the property name or version number, or outdated versions of the Android plugin for Gradle. To resolve the issue, ensure that the correct version of the NDK is installed on the system and check that the property is correctly defined in the build.gradle file.