Looks like dokka creating more issues than solving...
* What went wrong:
Could not determine the dependencies of task ':kakao:dokka'.
> class org.gradle.api.internal.file.CompositeFileCollection$1 cannot be cast to class java.util.List (org.gradle.api.internal.file.CompositeFileCollection$1 is in unnamed module of loader org.gradle.internal.classloader.VisitableURLClassLoader @48533e64; java.util.List is in module java.base of loader 'bootstrap')
Looks like dokka creating more issues than solving...