While upgrading or submitting new application, you may get an error message from the App Hub saying…
The [NeutralResourceLanguage] attribute is missing on the entry assembly. (2003)
Here is what you need to do. If you don't want to do all of that, try doing this…
Go the Properties page of your Project
Click Assembly Information, in the Application Tab.
Set it to English
Compile and resubmit.
I was facing the same issue, and this got me running. YMMV!
Until next time, 
Rahul
Quote of the day: I can believe anything, provided that it is quite incredible. - Oscar Wilde
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