Ubuntu 13.04 (64-bit) and VirtualBox 4.2 extension pack installation problem

Today i have reinstalled my company workstation to Ubuntu 13.04 Raring Ringtail. After that i have installed VirtualBox 4.2 and wanted to install extension pack from VirtualBox homepage Oracle_VM_VirtualBox_Extension_Pack-4.2.16-86992.vbox-extpack. So I went to File->Preferences->Extensions and clicked Add package… and after that i have got error message like this:

After googling the net i have found a solution for that which was:

Closing the VB and starting it again solved the problem.

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