ITunes 11.4 update and system error message?

I recently updated my MacBookPro iTunes to 11.4.  As soon as it was "completed" I got the following error.
System Extension Cannot Be Used
"/system/library/extensions/AppleUSBEthernetHost.kext" was installed improperly.
What does this mean? Is it a problem?  How can I fix it?
I also updated my Epson printer software at same time, but I'm thinking the error message is not related to the printer.
Message was edited by: Kawahine

Browse the forum history.  There's been dozens of topics about this over the past week.

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