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I had this problem when i created a eboot with Tustin eboot builder 1.03.
Step One: When you create the eboot open a FTP manager(I prefer FileZilla)
Step Two: After you are connected to the FTP manager go to advanced warfare.(If you don't know how just comment below i'll help you out.)
Step Three:You will need to delete the old eboot and copy the new eboot to the Advanced Warfare folder.
Step Four:When you finish copying it right click the eboot and than you will see file permission(click it).
Step Five: Than you will need to change the numerical value to "666" without the quotation marks and click ok.
Step Six:Exit out of the FTP manager and start up Advanced Warfare.
Step Seven:Enjoy
For those don't know how to use a FTP manager just Google a tut for it.