The error says: “Error: Cannot bind widget [W_ShooterHUDLayout_C_0] to action [UI.Action.Escape] - provided tag does not map to an existing UI input action. It can be added under Project Settings->UI Input”. I looked in Project Settings and found nothing akin to what the error message said, I could be missing, too. This problem doesn’t allow the Escape Menu to open.
Hello - Since this was a top result for me while searching; what seemed to sort it for me was adding the following entry to my DefaultInput.ini file and rebuilding. I snagged the line from the Lyra project.
[/Script/CommonUI.CommonUIInputSettings]
+InputActions=(ActionTag=UI.Action.Escape,DefaultDisplayName=NSLOCTEXT("[/Script/CommonUI]", "DDDC55F044A6D009AE3FC89634A4FBE3", "Back"),KeyMappings=((Key=Escape),(Key=Gamepad_Special_Right)))
Hope this helps someone.