Scary Message when attempting to Sync Apps to my 3GS

downloaded a free app from iTunes on my MBP no problem but when I attempt to sync the app from the sync screen the message says if I do so, every existing app on my iPhone will be replaced with the apps in my itunes, which right now is only one. all I want to do is add an app to my iPhone

You can't find it on the apps store on your phone?

Open iTunes and with phone connected and;


Click for full size

I would like to know what the App was that gave you this scary msg .....
Why not try syncing it anyways if you only have one other App on it.

And if it does get rid of it, resync your iPhone and put the deleted app back on, and then TRASH that scary App.
It sound like a weird msg to get anyways IMO

Cheers

Are you using different iTunes accounts on your phone and mac?