Comment 4 for bug 71630

That same error in Feisty:
/usr/share/themes/Mist/gtk-2.0/gtkrc:6: error: unexpected character `@', expected string constant

I received no other errors after doing the following fix:
http://ppatil.wordpress.com/2007/04/25/getting-vmplayer-running-on-ubuntu-feisty/

After changing the theme, it worked.