Hi, Samuel 

Thanks for reaching out to us

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It seems like the wpDataTables counter got stuck in the database, and now it's trying to add a new table with an existing ID.

If you have access to your database, please first take a look and see what the last ID is. In my example below, it's wp_wpdatatable_9:

Then, access wp_options table and click on "Search" in the top menu. In the "option_name" section, type "wdtGeneratedTablesCount" and search for that:

That will return one row which will display the count in the "option_value" column. In my database, it's correctly set to "9", but on your end, it's most likely wrong:

So, based on the last ID you see in your database (for example, if it's wp_wpdatatable_127) change the option_value in the screenshot above from 124 to 127 (again, this is just an example). Save that, and try to create a table again.

Please let me know how that goes.

Thank you