My iTunes all of a sudden started to give me this error when I tried to download from iTunes Store.  It started when I recently added a new iPhone to my computer and while adding music from iTunes to my iPhone it told me I didn't have access permission to do app updates.  It then erased all apps from my phone and started to give the this message each time I open iTunes (iPhone is not connected): iTunes couldn't download your purchase You don't have write access for...