HELP : Action Commands Plug-In

Does the "Action Commands" plugin only work with some firmware?
Is there a M118 command that works with the Stock CR-10 Firmware? Or is the "Actions Command" plug-in not compatible?

Send: M118 //action:done
Recv: ok
Recv: echo:Unknown command: "done"

done is configured as a system command in "Action Commands" plug-in.

There's not enough information here to answer your question. Enable the serial.log and then post it along with the octoprint.log. You may have to open an issue on the plugin's github page.