Activating extension `fwcd.kotlin` failed

Hi!

I'm having issues opening a folder which contains multiple projects in subdirectories. They contain Maven projects and are made up of a mixture of Java and Kotlin files. The Java language server works fine, but the Kotlin one doesn't start (it works fine when I open single projects).

The exception thrown is:

```
[Extension Host] Here is the error stack: Error: Internal error.
at handleResponse (/Users/martinliersch/.vscode/extensions/fwcd.kotlin-0.1.12/node_modules/vscode-jsonrpc/lib/main.js:436:48)
at processMessageQueue (/Users/martinliersch/.vscode/extensions/fwcd.kotlin-0.1.12/node_modules/vscode-jsonrpc/lib/main.js:263:17)
at Immediate.setImmediate [as _onImmediate] (/Users/martinliersch/.vscode/extensions/fwcd.kotlin-0.1.12/node_modules/vscode-jsonrpc/lib/main.js:247:13)
at runCallback (timers.js:789:20)
at tryOnImmediate (timers.js:751:5)
at processImmediate [as _immediateCallback] (timers.js:722:5)
```

Any ideas?

Goddchen