dokka exception

  1) Error injecting constructor, java.lang.RuntimeException: Exception while loading package-list from ExternalDocumentationLinkImpl(url=https://docs.oracle.com/javase/6/docs/api/, packageListUrl=https://docs.oracle.com/javase/6/docs/api/package-list)
    at org.jetbrains.dokka.PackageListProvider.<init>(ExternalDocumentationLinkResolver.kt:35)
    at org.jetbrains.dokka.PackageListProvider.class(ExternalDocumentationLinkResolver.kt:35)
    while locating org.jetbrains.dokka.PackageListProvider
      for parameter 4 at org.jetbrains.dokka.ExternalDocumentationLinkResolver.<init>(ExternalDocumentationLinkResolver.kt:204)
    while locating org.jetbrains.dokka.ExternalDocumentationLinkResolver
      for parameter 4 at org.jetbrains.dokka.DeclarationLinkResolver.<init>(DeclarationLinkResolver.kt:10)
    while locating org.jetbrains.dokka.DeclarationLinkResolver
      for parameter 0 at org.jetbrains.dokka.PackageDocs.<init>(PackageDocs.kt:20)
    at org.jetbrains.dokka.PackageDocs.class(PackageDocs.kt:19)
    while locating org.jetbrains.dokka.PackageDocs

  1 error