Application Loader Error: Launch Path Not Accessible

I'm trying to submit an application to Apple but am coming up with an error in Application Launcher.

Once I choose the zip file I hit Send and it comes up with the error:

Exception while validating: launch path not accessible

No idea what to do here, can't find much info on it at all on the net.

I have tried reapplying my provisioning / distributio开发者_运维知识库n profiles with no luck. Have re-opened XCode many times in case it was confused.

I submitted the same app a week and a bit ago and it went through fine, it got rejected so I made a few small changes and now this error comes up - no big changes were made.

The only thing I can think of is that I needed to update XCode and the SDK - from xcode_3.2.4_and_ios_sdk_4.1 to xcode_3.2.5_and_ios_sdk_4.2_final as the iPad I am using was updated to 4.2.

Any ideas on where to go from here would be greatly appreciated.

i had same problem, closed App Loader, restarted App Loader, problem solved.