Exception in thread "main" java.lang.ClassCastException: java.lang.Double cannot be cast to java.lang.Integer

[Nik3939]

Hello!
I am trying to export my tree in SVG and the window was unresponsive (same for PDF, PNG, etc.).
I tried in the command line with the following command:

java -jar .\lib\figtree.jar -graphic SVG .\lib\mytree_MP.tre output.svg

What I got back is the following error message:
Exception in thread "main" java.lang.ClassCastException: java.lang.Double cannot be cast to java.lang.Integer

Anybody here have a clue of what should I do?

Thanks!