Errors when packaging the game

When I Cook the game I get this error: “DoesPackageExist: DoesPackageExist FAILED: ‘/Game/StarterContent/Textures/T_CobbleStone_Pebble_N (1)’ is not a standard unreal filename or a long path name. Reason: Name may not contain the following characters:” and 57 more of the errors.
The wierd this is all the assets have been deleted a long time ago, can anyone help me fix this problem.

Edit: I looked on the forum and already set my server mode to the same blueprint game mode, that didn’t fix the problem

Okay I fixes the problem, so if anyone else come across this problem this is what I did:
The files where still in the windows map even after deleted in Unreal4. U still have to delete them manualy.