app-id within the manifest-file deviates from the one originally registered

I just tried to update my apps and got this error message.

"The app-id within the manifest-file deviates from the one originally registered for this app."

I am absolutely sure I changed nothing in the manifest file.

And more than that. I keep a history/backup of all files I upload to the store and I tried to reupload the same file that is currently in the store and worked fine a month ago and got the same error.

Anyone knows what is going on?

Cheers,

Robinson