The main focus of WYZI Business Finder is location of Businesses on map.
Not inputing Google API map ID at first may allow your Google map to work but not for long time. After a certain amount of requests per day, your map may disappear and something like this may appear instead.
That is why it is highly recommended to create Google Map API ID and input it in Theme.
After Creating ID, go to ToolKit Options -> Business Settings -> Google Map API Key and Save it there.