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e: /Users/.../linkfive_purchases-1.1.1/android/src/main/kotlin/io/linkfive/linkfive_purchases/LinkFivePurchasesPlugin.kt: (25, 9): Cannot access built-in declaration 'kotlin.Unit'. Ensure that you have a dependency on the Kotlin standard library
e: /Users/.../linkfive_purchases-1.1.1/android/src/main/kotlin/io/linkfive/linkfive_purchases/LinkFivePurchasesPlugin.kt: (29, 9): Cannot access built-in declaration 'kotlin.Unit'. Ensure that you have a dependency on the Kotlin standard library
e: /Users/.../linkfive_purchases-1.1.1/android/src/main/kotlin/io/linkfive/linkfive_purchases/LinkFivePurchasesPlugin.kt: (29, 20): Cannot access built-in declaration 'kotlin.String'. Ensure that you have a dependency on the Kotlin standard library
e: /Users/.../linkfive_purchases-1.1.1/android/src/main/kotlin/io/linkfive/linkfive_purchases/LinkFivePurchasesPlugin.kt: (31, 24): Cannot access built-in declaration 'kotlin.Unit'. Ensure that you have a dependency on the Kotlin standard library
e: /Users/.../linkfive_purchases-1.1.1/android/src/main/kotlin/io/linkfive/linkfive_purchases/LinkFivePurchasesPlugin.kt: (33, 28): Cannot access built-in declaration 'kotlin.Unit'. Ensure that you have a dependency on the Kotlin standard library
e: /Users/.../linkfive_purchases-1.1.1/android/src/main/kotlin/io/linkfive/linkfive_purchases/LinkFivePurchasesPlugin.kt: (41, 9): Cannot access built-in declaration 'kotlin.Unit'. Ensure that you have a dependency on the Kotlin standard library

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':linkfive_purchases:compileDebugKotlin'.
> Compilation error. See log for more details

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 1m 8s
Exception: Gradle task assembleDebug failed with exit code 1

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buildscript {
    ext.kotlin_version = '1.5.0'

    dependencies {
        ...
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}