Hello ,
This looks like the reason why your package is failing. Please keep in mind that spaces and special characters are not valid in file names for UE4.
UE4Editor-Cmd: [2015.05.22-14.39.42:034][ 0]LogPackageName:Error: DoesPackageExist: DoesPackageExist FAILED: '/Game/StarterContent/Textures/T_Concrete_Wall07 (1)' is not a standard unreal filename or a long path name. Reason: Name may not contain the following characters:
UE4Editor-Cmd: [2015.05.22-14.39.42:035][ 0]LogCookCommandlet:Warning: Unable to find package file for: /Game/StarterContent/Textures/T_Concrete_Wall07 (1)
Thank you!