How do I reinstall a "System/Library /Extension CNQL123_ClassicNotSize.kext"that was improperly installed and can not be used? It is causing iTunes to crash
I instaled the latest Safari Update and iTunes Update and now when I select Podcasts it crashes iTunes--it seems to only be the Podcast option that causes the crash. So how do i install or reinstall the system extension listed above, that cannot be used? The error message suggest that I reinstall or contact the vendor????? I also added an app to my dashboard which I have delected. Should I reinstall the system that came with the mini ---Leopard 10.6.2?
If it has an uninstaller use that. Be sure you delete the kext file; and you will need to restart afterwards.
If there is no uninstaller then see the following:
Uninstalling Software: The Basics
Most OS X applications are completely self-contained "packages" that can be uninstalled by simply dragging the application to the Trash. Applications may create preference files that are stored in the /Home/Library/Preferences/ folder. Although they do nothing once you delete the associated application, they do take up some disk space. If you want you can look for them in the above location and delete them, too.
Some applications may install an uninstaller program that can be used to remove the application. In some cases the uninstaller may be part of the application's installer, and is invoked by clicking on a Customize button that will appear during the install process.
Some applications may install components in the /Home/Library/Applications Support/ folder. You can also check there to see if the application has created a folder. You can also delete the folder that's in the Applications Support folder. Again, they don't do anything but take up disk space once the application is trashed.
Some applications may install a startupitem or a Log In item. Startupitems are usually installed in the /Library/StartupItems/ folder and less often in the /Home/Library/StartupItems/ folder. Log In Items are set in the Accounts preferences. Open System Preferences, click on the Accounts icon, then click on the LogIn Items tab. Locate the item in the list for the application you want to remove and click on the "-" button to delete it from the list.
Some software use startup daemons or agents that are a new feature of the OS. Look for them in /Library/LaunchAgents/ and /Library/LaunchDaemons/ or in /Home/Library/LaunchAgents/.
If an application installs any other files the best way to track them down is to do a Finder search using the application name or the developer name as the search term. Unfortunately Spotlight will not look in certain folders by default. You can modify Spotlight's behavior or use a third-party search utility, Easy Find, instead. Download Easy Find at VersionTracker or MacUpdate.
Some applications install a receipt in the /Library/Receipts/ folder. Usually with the same name as the program or the developer. The item generally has a ".pkg" extension. Be sure you also delete this item as some programs use it to determine if it's already installed.
There are many utilities that can uninstall applications. Here is a selection:
AppZapper
Automaton
Hazel
CleanApp
Yank
SuperPop
Uninstaller
Spring Cleaning
Look for them at VersionTracker or MacUpdate.
For more information visit The XLab FAQs and read the FAQ on removing software.
Similar Messages
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/System/Library/Extensions/AppleUSBEthernetHost.kext" installed improperly
I am trying to install a new wireless printer and keep getting this message: /System/Library/Extensions/AppleUSBEthernetHost.kext” has been improperly installed. How Can i repair this?
Open the AppleScript Editor in the /Applications/Utilities/ folder, copy and paste the entire following line into it, and press the Run button:
do shell script "chown -R root:wheel /System/Library/Extensions/AppleUSBEthernetHost.kext" with administrator privileges
If it doesn’t work, throw that item away and then reinstall iTunes.
(114242) -
Please help!
After installing iTunes 11.0.1 I got a splash screen that appears after all updates. The screen reads:
System extension cannot be used
"The system extension “/System/Library/Extensions/PulseDriver.kext” was installed improperly and cannot be used. Please try reinstalling it, or contact the product’s vendor for an update."
Question: How do I re-install or replace this file?
JimI submitted the above question, later finding that it has been answered by Buller already. No one need reply as Buller's answer seems to solve the problem for others, and I'll try that.
Jim -
I keep receiving this 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." How do I do it, please?
I couldn't find the extension to get rid of it.
In the Finder, follow the path given above: "System/Library/Extensions/AppleUSBEthernetHost.kext" -
I have started getting this error every time I download anything to my computer. I want to know how to fix the issue so it dosen't happen anymore. The error is as follows:
The system extension “/System/Library/Extensions/IOBDStorageFamily.kext” was installed improperly and cannot be used. Please try reinstalling it, or contact the product’s vendor for an update.
Please help me.Darned drivers. Did you try using it without the drivers? They may already be in Mountain Lion. I'm super wary of vendor drivers for OS X; they're terrible and often an OS version out of date.
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After that, try using the printer WITHOUT installing the darned Lexmark drivers. -
/System/Library/Extensions/hpPlugInInit.kext was installed improperly How do I reinstall correctly? I can never upgrade software because of this error.
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I have this error message:
System extension cannot be used
The system extension “/System/Library/Extensions/AppleACPIPlatform.kext” was installed improperly and cannot be used. Please try reinstalling it, or contact the product’s vendor for an update.
Please help. Is there a update or how do I reinstall?
Thanks,
JohnI submitted the above question, later finding that it has been answered by Buller already. No one need reply as Buller's answer seems to solve the problem for others, and I'll try that.
Jim -
I get this message often when updating things. I have told Small Dog Computer where I buy my stuff, and they didn't have an answer. Thanks in advance.
What does this mean? ... System extension cannot be used ... The system extension "/System/Library/Extensions/IOFireWireWDHID.kext" was installed improperly and cannot be used. Please try reinstalling it, or contact the product's vendor for an update.Interesting ... thank you! Actually I had that external drive, Western Digital, a while back on my second last? or third last? laptop ... the external drive died with a slew of pictures I had carefully uploaded to it :-(
I won't worry about it anymore :-)
sorry you got only 5 points, can't figure how to give you 10 points. -
I get the error message after updating itunes:
System extension cannot be used
The system extension “/System/Library/Extensions/AppleUSBthernetHost.kext” was installed improperly and cannot be used. Please try reinstalling it, or contact the product’s vendor for an update.
What or how do I fix this?"I get the error message after updating itunes:
System extension cannot be used
The system extension “/System/Library/Extensions/AppleUSBthernetHost.kext” was installed improperly and cannot be used. Please try reinstalling it, or contact the product’s vendor for an update.
What or how do I fix this?"
I have a MacBook Pro running Mas OS X Version 10.7.5
Is this a problem I need to fix? Is there a fix or update? -
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 -
System/library/Extensions/hplugininit.kext how to update ?
When updating i-Tunes I get a message that System/Library/Extensions/hplugininit.kext is not installed correctly. How do I re-install or update ?
See this thread: https://discussions.apple.com/thread/2641157?start=0&tstart=0
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What does this mean? What should I do?
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.You don't even have to type more than 8 letters:
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Trying to reinstall MX882 Canon printer after upgrading to OSX Mavericks. Printer will not print and I get a message "The system extension "/System/Library/
Extensions/AppleUSBEthernetHost.kext" was installed improperly and cannot be used. Try reinstalling it, or contact vendor for update."
What do I do and where is this extension?beverly216 wrote:
What do I do and where is this extension?
I would recommend you download and install the OS X 10.9.5 Combo Update.
That file is part of the operating system and it is located where the error shows, i.e. HD > System > Library > Extensions. It would seem that when you updated, this file and maybe others have not updated correctly. So running the Combo Update may help resolve this. -
Received following message during installation of an iTunes update today (9/16/14): System extension cannot be used. 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. What is to be done about it?
Thanks for the reply. I'm not experienced in the inner workings of the iMac system and its programs, so please follow my train of thought as I try to find and understand your reply.
You wrote that I should check out "Please see - AppleUSBEthernetHost.kext error on installing iTunes update" and I did so.
There I found your reply of 9/1014 7:06 PM to j'ski stating: "There is a larger thread here which you may want to follow - system extension cannot be used AppleUSBEthernetHost.kext ."
And an earlier Post by Greg Earle of 9/10/14 5:57 PM stating: " You would have been better off doing open /System/Library/Extensions and then finding the AppleUSBEthernetHost.kext kernel extension icon in the Finder window that came up and moving it to the Trash."
And a subsequent Post on 9/15/14 at 2:59 PM by Rob Maurer stating: "This method worked perfectly for me. I am on a Mac Pro running Mountain Lion. Dragged the kext file to trash (I use EasyFind. Found the file, Revealed in Finder, dragged to Trash, entered admin password when requested). Downloaded iTunes 11.4 from the website. Installed from that download. Checked for that kext file in EasyFind again and found it had a creation date of 7/29/14 (the trashed one had a creation date from 2009). No more error messages. ITunes opens fine. Everything good. Will not update on my MacBook Pro until they fix this issue.
All of which leave me wondering - what is your answer/recommendation? Do I drag the kext file to trash, download iTunes 11.4 from the website and install it from that download, check for that kext file again to see if it has a later date than the initial one? And, if so, seed if iTunes opens okay or not? And if so, do not update iTunes again until Apple fixes whatever is wrong? -
Hopefully, i can get some help in resloving the issue below. i updated my harddrive at Techserve and have been getting this message evertime i try to install a new software. Help...
The system extension “/System/Library/Extensions/CDSDAudioCaptureSupport.kext” was installed improperly and cannot be used. Please try reinstalling it, or contact the product’s vendor for an update.That is a third-party extension, so I would reinstall that software unless you wish to try repairing the permissions on the extension yourself using the Terminal.
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