I wonder if you don't have the same issue as some Windows 10 users who tried Sweet Home 3D installer 5.2. Then the solution would be to install and use Java 8u51, or to use the Java version which comes with Sweet Home 3D 5.3 with a command similar to:
Just be sure to check the path of javaw.exe and FurnitureLibraryEditor-1.19.jar. The easiest way would be to drag and drop these files from the Windows explorer window to the cmd window.