Huawei Nexus 6P :: Bootloader Won't Unlock On 6.0.1

I checked oem unlocking and usb debugging. Fastboot and adb work. I unlocked to update to 6.0.1 a few days. I want to flash custome roms. so I went to unlock bootloader and get the following:

C:adb>fastboot devices
ertyugg(this edited for privacy) fastboot

C:adb>fastboot flashing unlock
usage: fastboot [ <option> ] <command>

commands:
update <filename> reflash device from update.zip
flashall flash boot + recovery + system
flash <partition> [ <filename> ] write a file to a flash partition

[Code] ....

Message shown :

options:
-w erase userdata and cache (and format
if supported by partition type)
-u do not first erase partition before
formatting
-s <specific device> specify device serial number

[Code] .....