Turkey
Joined: Jun 2, 2026
Post Count: 1
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Save Error: java.lang.NullPointerException with 4+1 Mezzanine House Project
Hi everyone,
I've been working on a 4+1 detached house with a mezzanine floor, based on one of the demo houses. However, whenever I try to save my project, I encounter the java.lang.NullPointerException error shown in the attached screenshot.
I suspect this issue might be caused by specific objects or assets within the project. I am currently using Sweet Home 3D version 7.6.
To resolve this, I tried creating a new project and copying all the contents over, but the issue persists, and I still cannot save the file.
Does anyone know how I can fix this error without losing my multi-story design? Any help would be greatly appreciated.
