unfortunately it did not help (hopefully I understood 'open the adapter in ...'.
here is the full message.
regards
Failed to open a session for the virtual machine Landshark Delphix Engine 2.0 for VirtualBox.
Implementation of the USB 2.0 controller not found!
Because the USB 2.0 controller state is part of the saved VM state, the VM cannot be started. To fix this problem, either install the 'Oracle VM VirtualBox Extension Pack' or disable USB 2.0 support in the VM settings (VERR_NOT_FOUND).
Result Code: E_FAIL (0x80004005)Component: ConsoleInterface: IConsole {8ab7c520-2442-4b66-8d74-4ff1e195d2b6}