Error response from daemon: Mount denied

Hi i was trying to run the command bellow

docker run -p 80:4000 -v //C:/Users/Abirmoy/Documents/GitHub/udemy-docker-mastery/bindmount-sample-1:/site bretfisher/jekyll

but im getting this error:

C:\Program Files\Docker\Docker\Resources\bin\docker.exe: Error response from daemon: invalid mode: /site.
See ‘C:\Program Files\Docker\Docker\Resources\bin\docker.exe run --help’.
PS C:\Users\Abirmoy\Documents\GitHub\udemy-docker-mastery\bindmount-sample-1> docker run -p 80:4000 -v --help
“docker run” requires at least 1 argument.
See ‘docker run --help’.

i’m running latest version of docker on windows 10