onRender problem: Type mismatch: inferred type is (Int, Any?, Any?) -> Unit but ((Int) -> Unit)! was expected

[simona114]

Trying to do
.onRender { _, _, _ -> pdfView.fitToWidth() }
and I get the error "Type mismatch: inferred type is (Int, Any?, Any?) -> Unit but ((Int) -> Unit)! was expected"