Unable to transfer music to my iphone (5.1.1) from itunes (10.6.3)

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. I have checked manually manage music and videos but when I attempt to apply it, I get the message > The iPhone is synced with another iTunes library. Do you want to erase this iPhone and sync with this iTunes library? An iPhone can be synced with only one iTunes library at a time. Erasing and syncing replaces the contents of this iPhone with the contents of this iTunes library.

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That is correct. This is how it works.

You need to use your backup copy of your computer to put everything back.

I am having the same problem. Have you found a solution?

To import a library(Make sure you have consolidated your files first):

- Find it: (Usually under My Music)

-Copy over the entire itunes folder

- In itunes, click file, library, import. Locate the library you`ve just copied over (The itunes folder)

- Let itunes do it`s thing

-This will replace your current itunes library(Empty) with the old one(Including your songs and such)

After you`ve imported your library, Try these things:

- make sure your computer is authorized for the new content (Under store, click authorize this computer)

- if you have jailbroken, try restoring (Make sure to backup before trying this)

If it still says that it will erase your files, your library is either corrupt or incorrectly transferred.

If this is the case, it is rather inconvenient.

- Backup everything to icloud (Contacts, Mail etc.)

- Transfer all purchases to itunes

- Let itunes deleteeverything and re sync. (Make sure everything is backed up and that all your files are in itunes)

reconnect your iphone again to pc n open itunes let it sync itself after the sync process it is ready for transfering the music...u shud wait for the sync to get finished

i hope u already marked the box Manually Manage Music n videos

it worked for me