Problem using bbswitch and optirun

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https://bbs.archlinux.org – I follow the instructions of the wiki to install bumblebee with intel and nvidia optimus card.When I run cat /proc/acpi/bbswitch I get the following error:cat: /proc/acpi/bbswitch: No such file or directoryIf I try to run sudo modprobe bbswitch I get: ERROR: could not insert 'bbswitch': No such deviceI have already installed bbswitch.Finally If I run:optirun glxgearsI get [ 2585.015815] [ERROR]Cannot access secondary GPU - error: [XORG] (EE) NVIDIA(0): Failed to initialize the NVIDIA GPU at PCI:1:0:0. Please [ 2585.015922] [ERROR]Aborting because fallback start is disabled.I boot m (HowTos)