Error at startup: "System Extension Cannot Be Used"

Since installing 5608 I get the following message after starting my Virtual Machine: System Extension cannot be used! The system extension "/library/filesystems/fusefs.fs/support/fusefs.kext" was installed improperly and cannot be used. Please try reinstalling it, or contact the product's vendor for an update.

What does this message mean and how does it affect my system? What should I do to correct this error situation? It does not appear to create any real problems because after I click "OK" it goes away the system boots normally and I cannot see any deleterious affects of the error.

Patrick Toomey
Charlottesville, VA

PS: I am using a 20" iMac, with 175 GB of free disk space, 3 GB of memory. I run Mac 0s 10.5.5 and have allocated 1 GB of memory to the Parallels VM and am using Windows XP home edition.

 

Try to perform permissions repair, as a first step from Applications/Utilities/Disk Utility

 

I ran disk utility 'repair permissions', then logged out, and rebooted my iMac. When I opened Parallels I got the same error message.

Patrick Toomey
Charlottesville, Virginia

 

I suppose one of the software may affect that driver
Either Antivirus, or third party device driver, or software like Tech Tools

 

This error is occurring with Parallels 4.0

I am now getting this exact error after upgrading to 4.0, build 3540. Do you suppose you might know how to resolve it?

 

Did you check my last post, what do you have from that on mac OS side?

 

I have also had this problem since Parallels V3 on my MacBook Pro.
Upgrading to V4 has not fixed the problem.
I've upgraded MacFUSE to the latest version (still broken) and finally to 2.1.5 Beta (still broken).
My error message pops up as soon as my Parallels session for XP Pro SP3 runs up.
It tells me my copy of MacFUSE will not work because it was installed incorrectly.
I am not running any kind of AntiVirus or Malware programs in OS X 10.5.7 but I do in XP.

Should I try uninstalling parallels, then MacFUSE, then re-installing Parallels?
The thought is that Parallels only works with a certain version of MacFuse, and Parallels might need to install it?

 

Same issue here

Same issue here since V3 continuing after upgrading to V4. Functional significance? Fix?

 

Same here... Good Job!

Glad to see the Parallels Team is right on top of this problem! Now a year and a half since the last post here. I've been having this same problem since version 5 and now I'm on 6.0.11...

Did anyone ever figure this out? Permission repair & reinstalling the ancient MacFUSE don't do anything for me.

A Google search shows this problem is prevalent. I think it's about time you took care of it.

 

Great...

I just got the same error message upon installing the trial version of Parallels 6 on my new Imac. I WAS thinking about purchasing Parallels, but with this prevalent issue and no one seeming to really care to address it - that kind of speaks volumes about what I might face in the future with this product. :-/ Not sure I want to pour money into software that isn't supported.


To clarify, this is the alert box I am seeing upon opening Parallels:

System extension cannot be used

The system extension "?Library/Filesystems/fusefs.fs/Support/fusefs.kext" was installed improperly and cannot be used. Please try reinstalling it, or contact the product's vendor for an update.

 

Just to be fair...

A new MacFuse did just come out fairly recently today is 2/15/2011. And for some reason my problem did go away although it was not due to reinstalling MacFuse.

 

Didn't work for me

I tried reinstalling the MacFuse thing today but it didn't solve the issue.

 

I'm having the same "problem" with Parallels 5 (latest build as of July 25/11), but it doesn't seem to be interfering with my use of the software in any way. Is this something I should just ignore, or is it something that's necessary to solve?