All dimensions must to be on "0".

Try clicking "Check for updates" in the "Source Engine Export" tab.

Are you sure it has to be zero? Is there any way to reset the dimension but keep it in the same way? I can reset Scale, Rotation and Location and keep them at the same time, but there seems to be no point for dimension :/

Originally posted by Akuba:

Are you sure it has to be zero?

No, because if the dimensions were 0x0x0, that would mean every single thing would be at the exact same point, basically invisible. Dimensions/Size has nothing to do with being able to export or not.

Ok, while checking the mesh I found out that there still not renamed materials but there is still one self-explanatory problem: http://up.akuba.eu/2015-05/26115831.png
Does anyone know how to fix this? I only find tutorials to use Kanji for Text. And yes, Asian languange pack for windows is installed.

You can double-click on each item to change its name. You can also turn on international fonts in Prefs > System to see the characters properly

However, Unicode material should either be supported or produce a friendlier error message. I'll look into fixing that.

Source doesn't support unicode material names, so you'll need to change them regardless. I'll replace the error with a warning on export.