The embedded Kawa version (1.8, I think) is out of date. The fix might be as simple as swapping the .jar for the [current 2.1 version](https://www.gnu.org/software/kawa/Getting-Kawa.html).
The embedded Kawa version (1.8, I think) is out of date. The fix might be as simple as swapping the .jar for the current 2.1 version.