Cannot Sync Unknown Error -50

OK, here is the issue as concisely as I can put it.  I have just updated my iPhone 4 to iOS 7.0.3 and updated iTunes to 11.1.2.  Today I downloaded an app from a third party site (reputable) which then opened iTunes and clicked download.  I then went to sync my iPhone only to discover I was logged into iTunes as, my Apple ID.  Unfortunatly being an early user of iTunes my iTunes and App Store login ID is not my Apple ID.  So I logged out of my Apple ID and logged back in using my usual login and password which is the same on my iPhone for iTunes and App Store.  I then received a "this iPhone cannot be Synced Unknown Error -50"  The app I downloaded appears in each login but the phone stops syncing when it reaches apps. 
So should I delete the app from my purchases in my Apple ID login and try again?  I have already removed it from my Mobile Apps folder.
And can I get rid of the Apple ID account in iTunes?  I have checked purchases in this account and apart from the app I downloaded today ther's nothing in it.
Is there a way to merge the two accounts?
I'm confused.

Hello, a couple of old possible fixes...
http://www.edtechhacks.com/2007/12/solved-itunesiphoto-sync-error-50.html
http://reviews.cnet.com/8301-13727_7-10435935-263.html

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