Cannot launch ,y level after update from 4.10.4 to 4.11.0

after update the editor from 4.10.4 to 4.11.0 i cannot launch my level anymore. I’ve done the following:

  • deinstall all and install UE4 new
  • Delete the save folder
  • build everything new

On launch i got an error (PackagingResults:Error: Error Launch failed! Unknown Error) when i will package anm run the exe it crashes. Any ideas?
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Please follow these instructions and your issue should be resolved:

  • Open up the Epic Games Launcher
  • Click on the Library tab
  • Click on the yellow and black downward arrow beside Launch
  • Click on Options
  • Make sure that there is a check-mark beside ‘Editor symbols for debugging’
  • Press Apply

Once you’ve done that, it should update the editor for you and this issue should go away. Please let us know if it does not.