Article link: https://docs.unrealengine.com/latest/INT/Programming/Tutorials/FirstPersonShooter/2/1/index.html
Engine version: 4.14.2
Detailed description of the issue: Missing necessary step in Setting the Default Pawn Class part. Before playing, I must drag a BP_FPSCharacter blueprint class into the level editor, otherwise I can’t start it with BP_FPSCharacter as my default pawn.
Screenshots: N/A.
Additional info that is helpful: I found that if I drag a BP_FPSCharacter blueprint class into the level editor, the red text will be displayed as this document says, but the default pawn still isn’t BP_FPSCharacter. Strange thing is, I restart the whole solution and engine, then it just works fine. My operating system is Windows 10 Professional 1607(14393.576) updated from a Windows 8.1.