From the looks of it, you may not have the resource.cfg file installed properly, and/or your base game isn't properly patched to make use of the new method for installing mods.
I have the resource.cfg file but I heard somewhere that i might need a new one? Im not sure but I was just wondering if there is something im missing. Also, i have windows 7, and before windows xp and it worked on xp.
Thank you
There was a patch released for the base game just before the launch of Ambitions that made using mods a lot simpler. You still need the resource.cfg file setup properly to make use of most things, however. If you want a simple method for getting the Framework installed so you can use mods, try
Delphy's Framework Installer Tool. It'll set everything up for you.
For what it's worth: the current full versions are: 1.19.44.010017 for the base game, and World Adventures is 2.14.4.010017.
ETA: super edit to make things less confusing.