i had attempted this for my version of this error. using your command allowed me to run the world but permissions were not quite right and the world was regenerated. to fix this i used the following command:
chown -R 777 /var/games/minecraft/servers/[servername]
for anyone else wondering how to fix this issue, a user on another thread posted a very helpful walkthrough which i was able to follow:
NOTE at the end you see the user suggest using:
chmod -R 777 Import_World
please, if youre on FreeBSD, use the full file location as i have shown above and run this from within the jail the mineos plugin is installed.