After the upgradation of WordPress found the following error.

Tags were displayed on the bottom of the page. When clicked on the tag the page started returning a “404 Not found” error.

Doing some research found that its being created by Permalink. When Permalink set to default, the tag clicks works perfect.

After doing an intensive research the best and easy solution is as following:

  • Go to Plugin -> Add New
  • Search “WCS Custom Permalinks Hotfix” (without the quotes) or Download from the link
  • Install the Hotfix and Activate the same.

Enjoy!!!