This looks like a packaging issue. Use the official release available at Download page.

When running the downloaded jnlp version on the same system with javaws, the SVG export works without error.

I filed a bug report at https://bugs.archlinux.org/task/75632.

Greetings,

Using Sweet Home 3D 7.0.2 under Archlinux and OpenJDK Runtime Environment (build 11.0.16+8). When I select the Plan->Export to SVG Format command and specify file, I get the following dump on terminal:


java.lang.NoClassDefFoundError: org/freehep/graphicsio/svg/SVGGraphics2D
at com ...