After upgrading to Moodle3.2.1+ (Build: 20170202), I started getting this warning message as I tried to upgrade plugins:
Exception - Call to undefined method flexible_table::get_download_menu()
At first, the site loaded, but Site Administration (accessed from the Administration block) would not open when I clicked on the triangle that expands the Site Admin menu.
There are still some plugins that I can upgrade and, after adding them to the server, I am able to see the page that displays plugins needing my attention and follow the upgrade process. However, when the upgrade finishes, I get the above warning and an option to "Continue", but when I try to do so, the page goes blank. Nothing but a white screen is displayed.
I can't find any reference to this on the net, so I post here in the hope that someone may be able to help me.