Error when launching my game

When i try to launch my game i get this error

PackagingResults:Error: Error Launch failed! Missing UE4Game binary.
You may have to build the UE4 project with your IDE. Alternatively, build using UnrealBuildTool with the commandline:

I’ve had this problem in the middle of a gamejam.

this is my black magic list:

  • AVOID _ in Blueprint names, Folders and Levels!
  • DISABLE most unused plugins, especially experimental ones
  • right click content in content explorer and *fix redirectors *
  • delete most of /saved/, except screenshots in saved and save game
  • delete /intermediate/, /build/, /binaries/ + restart project
  • often Packaging has to be done once before Cook

Let me know if that worked for you.