I've recently installed Ubuntu 11.04 and downloaded the "Sweet Home 3D" program from the Software Center. It installed and it shows up as one of the applications when I search for it, but I cannot get it to start at all. Any idea how I can do this or if this is a known issue?

I am using a Dell Studio 15 1558 laptop and the fglrx driver for my ATI graphics card. But I have a feeling that this problem has nothing to do with hardware or drivers.

Edit:
This is what I get when I type 'sweethome3d' in the terminal:

zeiger@ubuntu:~$ sweethome3d

[warning] /usr/bin/sweethome3d: Unable to locate /usr/lib/jvm/java-6-sun/jre/lib/javaws.jar in /usr/share/java

Exception in thread "main" java.lang.NoClassDefFoundError: javax/jnlp/UnavailableServiceException

Caused by: java.lang.ClassNotFoundException: javax.jnlp.UnavailableServiceException

    at java.net.URLClassLoader$1.run(URLClassLoader.java:217)

    at java.security.AccessController.doPrivileged(Native Method)

    at java.net.URLClassLoader.findClass(URLClassLoader.java:205)

    at java.lang.ClassLoader.loadClass(ClassLoader.java:321)

    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)

    at java.lang.ClassLoader.loadClass(ClassLoader.java:266)

Could not find the main class: com.eteks.sweethome3d.SweetHome3D. Program will exit.

zeiger@ubuntu:~$

And I installed SweetHome3d using the Ubuntu Software Center.