Problem installing GWD in the Elementary OS

[edugu...@gmail.com]

Hello guys, Im having a problem to install GWD in my elementary OS, it's a distr. of Ubuntu 12.04
I donwloaded the .deb, when I run it with:

sudo dpkg -i google-webdesigner_current_amd64.deb

it starts to run and appears im my terminal:

Warning in file "/usr/share/applications/pantheon-files.desktop": usage of MIME type "x-directory/gnome-default-handler" is discouraged ("x-directory" is an old media type that should be replaced with a modern equivalent)

Warning in file "/usr/share/applications/pantheon-files.desktop": usage of MIME type "x-directory/normal" is discouraged ("x-directory" is an old media type that should be replaced with a modern equivalent)

Warning in file "/usr/share/applications/sublime-text-2.desktop": usage of MIME type "x-directory/normal" is discouraged ("x-directory" is an old media type that should be replaced with a modern equivalent)

Warning in file "/usr/share/applications/open-pantheon-terminal-here.desktop": usage of MIME type "x-directory/normal" is discouraged ("x-directory" is an old media type that should be replaced with a modern equivalent)

I dont know what it means, but i saw the GWD icon in my files. When I start it, it shows a full white window, and nothing more. Probably the installation didn't work.

Can someone help me?