How to run Libreoffice Online (docker install using http://bit.ly/2oO14YH)

[beachstar]

Libreoffice Online 5.3 installed and running , using docker / http://bit.ly/2oO14YH .
How to run libreoffice
After entering:

“docker run -t -d -p 127.0.0.1:9980:9980 -–cap-add=MKNOD libreoffice/online:master”

receive :

unknown shorthand flag: ‘â’ in -–cap-add=MKNOD

(same for -–cap-add MKNOD)

After entering:

docker run -t -d -p 127.0.0.1:9980:9980 -e “” –cap-add MKNOD libreoffice/online:master

receive:

Error response from daemon: driver failed programming external connectivity on endpoint jovial_galileo (a48bcf221fb16b6e9be13e8b1667a7c42355162924713635526c721de74bc8e0): Bind for 127.0.0.1:9980 failed: port is already allocated.

Any suggestions ?

(edit: added code-format)