Adding new items to gnome menu

[Bytal]

Im trying to add a launcher to the gnome2 menu and when I right click on an item and choose whole menu -> add new item to this menu, it pops up an error message saying. "You cannot create a launcher at this location since the location is not writable" Now I've checked the .gnome and .gnome2 directories in my home forlder and they all seem writable by me. Whats going on here?
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