[kotlin] Unresolved reference: javaClass [UNRESOLVED_REFERENCE]

Hello, I have an UNRESOLVED_REFERENCE many function.

Java version
```
openjdk 11.0.1 2018-10-16
OpenJDK Runtime Environment 18.9 (build 11.0.1+13)
OpenJDK 64-Bit Server VM 18.9 (build 11.0.1+13, mixed mode)
```

I use the version 0.1.11 of the plugin

I save this issue https://github.com/fwcd/KotlinLanguageServer/issues/22. I don't know how to install the version 0.15.

Best regards

Start by reviewing the screenshots and the linked KotlinLanguageServer issue #22, then reproduce the unresolved javaClass reference with plugin version 0.1.11 and the reported Java 11 environment. Done means identifying why the reference is unresolved and confirming that the reported Kotlin code resolves correctly.

Written by the indexing model from the issue text.