This happens because the JVM bundled with the program is outdated. Please check this post on the forum: https://www.sweethome3d.com/support/forum/viewthread_thread,11549_lastpage,yes#66616
LATEST VERSION
Hi Olivier, I have just updated the list, but I can't find ExportToXMLOBJ anywhere, maybe it is an alias of some other plugin?
Sorry, I've found a few bugs, it will require some time to fix them. By the way, if you only need horizontal and vertical dimension lines (not 3D diagonal ones), then you can use the native dimension lines (if you edit them, you can set the elevation and orientation).
I guess both options are valid, of course the best is to train developers to take care of updating the version with each release.
That message was for VG38 :)
Hi Olivier, I do my best to keep the plugins catalog updated, I watch the forum from time to time to see if somebody published a new plugin/version, if they are posted just on sourceforge I will most likely miss them. I will check your list, thanks! By the way, I would more happy if developers would like to update the plugins catalog by themselves, the method is quite easy and described here: https://daniels118.altervista.org/sh3d/pluginmanager/dev_quick_start.php
Have you downloaded SweetHome3D installer from the official website, or are you using a Linux package manager?