I just downloaded Curse client to download the addons for me and when I do enable them in game and I load up my toon, a bunch of errors show up for the new ones. For example. like Fubar 3.0 and cartographer. These are showing up with errors and I don't know why. Anyone know what I should do?

Since you don't tell us what error messages pop up, my best guess is that you are missing some dependencies for the addons.

Go to this site and download the WowAceUpdater (WAU). Once downloaded, install it. Once installed, start the program, it will show a list of all your Ace addons. Before doing anything there, go to Edit > Preferences and make sure 'Automatic Dependency Download' is enabled. When this is done press OK and after that F10. A confirmation box will pop up asking you whether you want to update all your addons. When you accept, WAU will update all your Ace addons and will download any necessary dependencies.

Sorry to say WAU support is going to be discontinued.