Connect to host XXX port 22: Resource temporarily unavailable

This happens when I try to connect to my ec2 instace. Does someone know how to fix this issue?

sudo ssh -i "Robin.pem" -p 22 ubuntu@35.180.196.240 -v
OpenSSH_8.2p1 Ubuntu-4ubuntu0.4, OpenSSL 1.1.1f  31 Mar 2020
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: include /etc/ssh/ssh_config.d/*.conf matched no files
debug1: /etc/ssh/ssh_config line 21: Applying options for *
debug1: Connecting to 35.180.196.240 [35.180.196.240] port 22.
debug1: connect to address 35.180.196.240 port 22: Resource temporarily unavailable
ssh: connect to host 35.180.196.240 port 22: Resource temporarily unavailable