Failed to install the Extension Pack /tmp/Oracle_VM_VirtualBox_Extension_Pack-4.3.18-96516.vbox-extpack.

VBoxExtPackRegister returned VERR_VERSION_MISMATCH, pReg=0000000000000000 ErrInfo='Helper version mismatch - expected 0x10002 got 0x10001'.

Result Code: NS_ERROR_FAILURE (0x80004005)
Component: ExtPackManager
Interface: IExtPackManager {3295e6ce-b051-47b2-9514-2c588bfe7554}