After the upgrading of the tableau desktop, I am getting an issue while running the query.

There can be various reasons for this. One of the most common reasons can be due to the fact that when you upgrade the tableau desktop, a new version will be installed on your system. But when the new version will be installed on your system, older versions won’t get automatically uninstalled. And so, your system will have both versions of the software. And this can be the reason behind the trouble you’re facing. Try uninstalling the older version or the version you don’t want and you should be good.