ITunes doesn' recognize iPhone; Error Code -18

Has anyone experienced this problem? Suddenly iTunes doesn't recognize my iPhone. it shows up in iTunes simply as "apple iphone" and I get an error message telling me I have to reset to factory setting (wont let me do anything else and does not show my music/video's, but DOES open iPhoto). when I try to reset to factory settings, I get a second error message telling me can't reset to factory settings due to unknown error (-18).
I have quit and reopened iTunes. I have restarted computer. I have restarted iPhone. I have the latest version of iTunes and the latest version of iPhone OS. Anyone have any ideas?
Thanks much!

Having the exact same problem with my iPhone 4S.
This started happening right after upgrading iTunes to 11.1.5 - never encountered this issue before.
Tried doing the same thing you mentioned above with no luck at all.

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