Komodo is probably already running.
It just means you can't start it when it's already running. If it isn't running we can take a look at it. Check to see if it is running by running:
./verus getinfo
If it's running you'll get info back, if it isn't you'll get an error. If that throws an error, it's worth checking using this command:
ps fax | grep verus
and seeing if any processes are listed besides the process you're using to search. You would see verusd with a child process of komodo and all its cli arguments.
(submitted by @keda666, solution written by englal.vrsc@)
Note: last revision date 2020-02-26.