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The cause is this other exception: `java.lang.IllegalStateException: Error type encountered: [ERROR : &lt;ERROR FUNCTION RETURN TYPE&gt;] (DeferredType)`  It's not an informative message, to my eyes, unfortunately.

This mean you got to coge generation and it resolved and type checked properly but you seem to have found a bug in the codegen phase. Is there a minimal code example that triggers this? May be good to file an issue.

I managed to find a MCVE:
```class X {
    var x by x
}```
There was a typo in my code, which was equivalent to the example above. The IDE does not mark any error, so I didn't see it for a while.

<https://youtrack.jetbrains.com/issue/KT-43891>