/usr/bin/docker: Error response from daemon: driver failed programming external connectivity on endpoint app

Installation
4

Tried sudo lsof -i :80 and got.

COMMAND  PID     USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
nginx   3336     root    6u  IPv4  21408      0t0  TCP *:http (LISTEN)
nginx   3336     root    7u  IPv6  21409      0t0  TCP *:http (LISTEN)
nginx   3338 www-data    6u  IPv4  21408      0t0  TCP *:http (LISTEN)
nginx   3338 www-data    7u  IPv6  21409      0t0  TCP *:http (LISTEN)
nginx   3339 www-data    6u  IPv4  21408      0t0  TCP *:http (LISTEN)
nginx   3339 www-data    7u  IPv6  21409      0t0  TCP *:http (LISTEN)
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