Error message /system/library/extensions/appleusbethernethost.kext was installed improperly. how can i get rid of this message

In the course of an upgrade i received this message. How do I delete it?
The system extension "/system/library/Extensions/appleusbethernethost.kext was installed improperly and cannot be used. please try reinstalling it or contact the product vendor for an update.

There's a simplier fix now.
Follow , 6plus55
Upgraded to iTunes 11.4 and now it won't sync my iPhone 5s-sync button is greyed out.
hey guys just got off the phone and solved my problem. i have a 6+ and my mac is a core duo macbook from 2006 on snow leopard.
this is what i did:
download and install a clean copy of 11.4 (even if its already installed, run the installer again)
click the following link to empty your syncing cache. following the instructions for your operating system
restart itunes and voila!
OS X: Resetting Sync Services

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