java.util.concurrent.ExecutionException: java.lang.ClassCastException: java.lang.String cannot be cast to kotlin.Unit

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java.util.concurrent.ExecutionException: java.lang.ClassCastException: java.lang.String cannot be cast to kotlin.Unit
at java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:357)
at java.util.concurrent.CompletableFuture.get(CompletableFuture.java:1895)
at undefined.TestClass.test(Test.kt:31)

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