I install windows 8 but message said cannot detect bootable disc?

Hi I am trying to install windows 8 on my mac air but when im done with partioning it cannot detect my bootable device which i have created from bootcamp on my usb drive. Now i'm stuck with the message "Insert Bootable Device and press any key to continue".. I trying turning it off but when i put it on it's still the same message i am receiving. Please If anybody could help how can i cancel the installation since it doesn't read my usb drive.

Hi, hold alt key at bootup, or CMD+r keys at bootup.

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