This plugin is highly customizable. Therefor you cannot only create a table as you want with adding unlimited numbers of fields and content, you also need to define how the table will be published.
You need therefor first to setup the “Output Design”. The Error message says, that this not happened yet.
Go in the Admin Section of WordPress to the Custom Table you want to publish. Then you have 4 Register where one is called “View Setup”.
You can decide then which fields should be shown on the main table in a HTML format like:
If you activated the headerline and Overlay, please proceed also this Tabs.
If you setup the Entry Setup, the Table entries are click able and more details will be shown then.