Error Message on 7520 All In One Set up on MAC

Question

I have tried several times to install the drivers for the HP 7520 on my MAC (10.9.5 Mavericks).  Each time I get this error message;
The system extension “/System/Library/Extensions/AppleUSBEthernetHost.kext” was installed improperly and cannot be used. Please try reinstalling it, or contact the product’s vendor for an update.
The printer will still print fine, but it will not capture images when scanning or copying.  Does anyone have suggestions for a fix?  

Answer 1

Hi @angcavallaro 
The path /System/Library/Extensions/AppleUSBEthernetHost.kext points to an issue with the operating system.
Kext files are essentially drivers for Mac OS X. "Kext" stands for Kernel Extension; kext files "extend" Mac OS X's kernel, the core part of the operating system, by providing additional code to be loaded when your computer boots..... Technically, kexts aren't individual files. In fact, .kext "files" are essentially packaged like .zip files. - Source
I suggest repairing your disk permissions using the following steps;
On the Dock, click Applications, and then click Utilities.
Double-click Disk Utility.
Highlight your hard drive/partition on the left (by default this is "Macintosh HD").
Click the Repair Disk Permissions button at the bottom of the window.
Once the repair is complete, restart the computer and try scanning again.
You may even need to uninstall and reinstall the HP Software. Let me know if you need help with this.
What are permissions?
Every file and folder on a Mac OS X hard drive has a set of permissions —settings that determine which user(s) have access to each item, and exactly what that access is. For example, permissions dictate whether or not a particular user can open and edit a particular file. But permissions also determine which items the operating system—or specific parts of it—can access and modify, and which files are accessible by applications.
What does repairing permissions do?
The Repair Disk Permissions function—the process that actually performs the task of repairing permissions—examines certain files and folders on your Mac’s hard drive to see if their current permissions settings are what Mac OS X expects them to be; if discrepancies are found, the offending permissions are changed to match the expected settings. - Source
If repairing the disk permissions does not resolve the issue, you may need to delete the particular .Kext that is causing the error, I suspect doing an Apple update after would reinstall the missing .Kext, BUT, since I work on behalf of HP and not Apple, my area of expertise is not with the Apple operating systems in's and out's. I think, if repairing the disk permissions does not resolve the issue you should either reach out to the Apple Community or call Apple support.
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Sunshyn2005 - I work on behalf of HP