Failed to open a session after upgrade to El capitan

[DexterLiu]

After I upgraded my OS to El capitan yesterday, I can't open a session.
The detailed the error message is as followed, Please help me.

Result Code:
NS_ERROR_FAILURE (0x80004005)
Component:
Machine
Interface:
IMachine

Kernel driver not installed (rc=-1908)

Make sure the kernel module has been loaded successfully.

[socratis]

Try to re-install VirtualBox.

[DexterLiu]

Thanks, but it means all my previous data are gone ?

[socratis]

No it doesn't. Data is one thing. A program that uses that data is another. Even in OSX upgrades you don't lose your data.

[DexterLiu]

However, I try to re-install my original version-4.3.24 of virtualbox, it ends with unsuccessful installation.
Do I need to re-install the latest version ?

Appreciated

[socratis]

Oh dear, you were on 4.3.24! Oops, I didn't realize it (not that you told me ).

Yes, you should definitely go with the latest and greatest (5.0.20 as of this writing). El Capitan is not even a year old (2015-09-30) and the closest VirtualBox version that came after that was 5.0.6 (2015-10-02). After each release there were more and more El Capitan fixes. So, definitely 5.0.20.

BTW, which OSX version did you upgrade from, if you don't mind me asking?

[DexterLiu]

It works, thanks a lot.
The OS I upgraded from is some version of Yosemite, sorry I can't remember.