Request page not found after upgrading to phplist 3.6.4

Tags: #<Tag:0x00007fd1c3cc5550>

After upgrading to phplist 3.6.4, I get the following issue when I click on the

The requested page could not be found.

Also I get the following error messages when I click on the application

Any help is really appreciated. I have followed all the standard upgrade instructions from an older version of phplist to the newer support version. Thanks so much.