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Android Kotlin for Java Developers Modelling Solitaire Testing the Tableau: Adding Cards

Kotlin cannot access class

import org.junit.Test

class TableauPileTest {

@Test <<<<<<<<<<<< Error here
fun addCards() {

}

@Test <<<<<<<<<<<< Error here
fun removeCard() {
}

}

Error:(7, 6) Kotlin: Cannot access class 'java.lang.Class'. Check your module classpath for missing or conflicting dependencies Error:(12, 6) Kotlin: Cannot access class 'java.lang.Class'. Check your module classpath for missing or conflicting dependencies