Can you please provide the following information ?
1. Attach a screenshot of Illustrator's launch screen.
2. Attach a screenshot of the error you are getting in kuler.
3. Which OS are you using ?
1. Kuler panel in Illustrator CC shows themes that are created or liked by the user. Please go to https://kuler.adobe.com and check that there are themes in your account .
2. Kuler application is end of life & is no longer supported. Please use kuler website https://kuler.adobe.com/explore/ for browsing and searching themes.
Thanks & Regards,
Actually these url don't match.