Hello,
I wanted to use the PSSMRendering and got an Error on using some Shadow-File from the Common Assets file.
Later I tried to add a sky and got a similar Error Message:
Uncaught exception thrown in Thread[LWJGL Renderer Thread,5,main]
com.jme3.asset.AssetLoadException: An exception has occured while loading asset: Common/MatDefs/Misc/Sky.j3md
at com.jme3.asset.DesktopAssetManager.loadAsset(DesktopAssetManager.java:290)
So I believe something with my Common files is wrong.
I am using JMonkeyEngine with Ubuntu 14.04 and just did a normal Installation.
Did I forget to install some extra packages?
By the way I can’t use the scene builder, too.