I am running the GM version of Xcode 6 and am trying to validate my archive of my app. I went through iTunes Connect and filled in all the required information, yet when I try and validate I get an error saying "iTunes Store operation failed. Error Description not available." I've read somewhere that it needs to be in a state "Waiting for upload", but in the new iTunes Connect I don't know how to change it to that from "Prepare for Submission." The only thing that causes error in Connect is that I haven't selected a build, and to my knowledge (my first app) I can't do that until I validate mine. Any help is appreciated!
Happens to me as well, use Application Loader to submit.
Also, this link might help you when you receive error "this bundle is invalid. armv7s are required to include armv7 architecture" from Application Loader: IOS Application loader shows bundle error.

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