Did you try this ?
Please mark the answer as CORRECT & HELPFUL if it really helped you so that it can help others as well
Looks like there are multiple connection type errors related to different data-source types like SAS etc, what is your connection type?
Which version of Tableau Desktop/Server you are using ?
You might want to contact Tableau Support.
Thank you for your prompt response, Ritesh.
Here is the ifno
Connection Type: MS Sql Server
Tableau Version: 2018.02 /
Tableau Server: Tableau Online Server