Lets try again:
Blender 2.63 Windows 64 bits installed
Luxblend downloaded from this link:http://src.luxrender.net/luxblend25/archive/tip.zip
Luxrender 0.8 windows 64 bits NoOpenCL version installed
Folder LuxRender from luxblend archive inside Scripts/Addons
pylux that I got from LuxRender Installer inside the folder Scripts/Addons/Luxrender
Microsoft Visual C++ 2008 Redistributable Package (x64) installed.
And the result:
A new error. Every time that I do any changes on material editor, that error message show up.
-The material preview now isn't working at all.
-If I don't have objects in my scene (just lamps, for example) the export occurs normally (luxrender window pops up)..
-I looked for this error: "luxCleanup() called while inside world block" at "Common Error Messages", then I Enabled debug options, like it's saying in that section and the error was: 'Mesh' object has no attribute 'faces'. But it's a scene with default cube, a lamp and the camera. Here are my blend file and lxs file: