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Can anyone tell me what is wrong with this?

hard to say without seeing the code.  at a glance: the “required” type is nullable, the “found” type is not.

Yeah but should that really be a problem? I own the required type, making it non nullable doesnt solve it

making "Any" non nullable doesnt change anything

`arrayOf(arrayOf(1))` isn't compiling as expected in your code unless you specify the exact same type `Array&lt;Array&lt;Any?&gt;&gt;` explicitly because the type parameter of Array in Kotlin is invariant, it is actually declared as `Array&lt;T&gt;` not `Array&lt;out T&gt;` , the latter is equivalent to Array&lt;? extends T&gt;
Source: <https://github.com/JetBrains/kotlin/blob/ea836fd46a1fef07d77c96f9d7e8d7807f793453/core/builtins/native/kotlin/Array.kt#L15>