Trying to upload my app on my iPhone 4.2.1...unexpected error (0xC002)

Hi there,
I followed the whole process by Apple (I had my developer account since several months already)
BUT in XCode/Organizer, here is what I have :

Xcode has encountered an unexpected error (0xC002)
No such file or directory, at ‘/SourceCache/DTDeviceKit/DTDeviceKit-867/DTDeviceKit/DTDeviceKit_Utilities.m:864’

I read also this, and that-stackoverflow-post to test & dig… without any success.

On XCode side, I cannot see my device, but it is the same cause I guess…

any tips ?