I'm using Delphi 10.3.3. Today, I added a TActionManager to a form containing a TCheckList and set a few actions.
When I tried to compile, the IDE insisted on adding IDETheme.ActnCtrls to my Uses list, then failed to compile because it couldn't find the file.
I've been using Delphi since Borland Pascal, and this one is new to me.
What can I do? I've tried deleting, building instead of compiling, starting a new unit, a new project, restarting the IDE and starting a new project.
John Treder