The Kunena team has announce the arrival of Kunena 5.1.18 [K 5.1.18] which is now available for download as a native Joomla extension for J! 3.9.x. This version addresses most of the issues that were discovered in K 5.1 and issues discovered during the development stages of K 5.1.
Clicking Login shows 404-Error, it is urgent
I updated Joomla to new version of Joomla! 3.8.4 and immediately and I have this error 404 as shown in my attached. This occurs when users click on login button under kunena menu after entering their user details i.e password and username.