Kotlin .run scoped function - method 'void <init>()' not found - kotlin

Question

I have a problem with the following code snippet:
(Some functions' bodies are ommited for clear view)
fun collectLinks(page: Page): List<String> {
return LinksCrawler().run {
page.accept(this)
this.links
}
}
class LinksCrawler {
private var _links = mutableListOf<String>()
val links
get() = _links.toList()
fun visit(page: Page) { (...) }
fun visit(container: Container) = { (...) }
private fun visit(elements: List<HtmlElement>){ (...) }
}
When I invoke collectLinks() I get
Visitor$LinksCrawler: method 'void ()' not found
(where Visitor is my filename)
As far as I believe, problem would be caused by scope function .run(), maybe that it has no initialisation code that would do sth with LinksCrawler, but correct me if I am wrong.
I do it in .kts file, if it has any meaning. In overall, it is supposed to be an example for a Visitor design pattern. Full file code below:
import Visitor.HtmlElement.Image as Image
import Visitor.HtmlElement.Link as Link
import Visitor.HtmlElement.Table as Table
import Visitor.HtmlElement.Container as Container
main()
// ---------------
fun main() {
val page = Page(Container(Image(), Link(), Image()),
Table(),
Link(),
Container(Table(), Link()),
Container(Image(), Container(Image(), Link())))
println(collectLinks(page))
}
fun collectLinks(page: Page): List<String> {
return LinksCrawler().run {
page.accept(this)
this.links
}
}
class LinksCrawler {
private var _links = mutableListOf<String>()
val links
get() = _links.toList()
fun visit(page: Page) {
visit(page.elements)
}
fun visit(container: Container) = visit(container.elements)
private fun visit(elements: List<HtmlElement>){
for (e in elements) {
when (e) {
is Container -> e.accept(this)
is Link -> _links.add(e.href)
is Image -> _links.add(e.src)
else -> {}
}
}
}
}
fun Container.accept(feature: LinksCrawler) {
feature.visit(this)
}
fun Page.accept(feature: LinksCrawler) = feature.visit(this)
class Page(val elements: MutableList<HtmlElement> = mutableListOf()) {
constructor(vararg elements: HtmlElement) : this(mutableListOf()) {
for (s in elements) {
this.elements.add(s)
}
}
}
sealed class HtmlElement {
class Container(val elements: MutableList<HtmlElement> = mutableListOf()) : HtmlElement() {
constructor(vararg units: HtmlElement) : this(mutableListOf()) {
for (u in units) {
this.elements.add(u)
}
}
}
class Image : HtmlElement() {
val src: String
get() = "http://image"
}
class Link : HtmlElement() {
val href : String
get() = "http://link"
}
class Table : HtmlElement()
}