If you're having issues installing the Kudobuzz app on your Wix site, one or both of the following reasons could be the cause:
Your site is not published
For the Kudobuzz app to install successfully, your Wix site needs to be published and live. If you're yet to publish your site, do so, then delete the app and reinstall it and it should install successfully.
2. You have not provided your email address in your Wix settings area
You will need your email added to your Business Info in your Wix settings area. Make sure to have added it. Here are screenshots showing how to add it: