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In Kotlin for Android, a duplicate class error occurs when two classes with the same name are found in different modules, either within the same project or in different projects that are used as dependencies. This can happen when two dependencies have conflicting versions of the same class or when a class in the project has the same name as a class in a dependency. The error message will typically indicate which classes are duplicates and where they are located. To resolve this issue, the conflicting classes must be either renamed or excluded from the project.