I got this error when trying to connect to the server using ssh

$ ssh -vvv user@ip
OpenSSH7.4p1, LibreSSL 2.5.0
debug1: Reading configuration data /etc/ssh/sshconfig
debug1: /etc/ssh/sshconfig line 20: Applying options for *
debug2: resolving "128.199.240.57" port 22
debug2: sshconnectdirect: needpriv 0
debug1: Connecting to 128.199.240.57 [128.199.240.57] port 22.
debug1: Connection established.
debug1: identity file /Users/{myusername]/.ssh/idrsa type 1
debug1: keyloadpublic: No such file or directory
debug1: identity file /Users//{myusername]/.ssh/idrsa-cert type -1
debug1: keyloadpublic: No such file or directory
debug1: identity file /Users//{myusername]/.ssh/iddsa type -1
debug1: keyloadpublic: No such file or directory
debug1: identity file /Users//{myusername]/.ssh/iddsa-cert type -1
debug1: keyloadpublic: No such file or directory
debug1: identity file /Users//{myusername]/.ssh/idecdsa type -1
debug1: keyloadpublic: No such file or directory
debug1: identity file /Users//{myusername]/.ssh/idecdsa-cert type -1
debug1: keyloadpublic: No such file or directory
debug1: identity file /Users//{myusername]/.ssh/ided25519 type -1
debug1: keyloadpublic: No such file or directory
debug1: identity file /Users//{myusername]/.ssh/ided25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH7.4
debug1: Remote protocol version 2.0, remote software version OpenSSH7.2p2 Ubuntu-4ubuntu2.2
debug1: match: OpenSSH7.2p2 Ubuntu-4ubuntu2.2 pat OpenSSH* compat 0x04000000
debug2: fd 3 setting ONONBLOCK
debug1: Authenticating to 128.199.240.57:22 as '/{myusername]'
debug3: hostkeysforeach: reading file "/Users//{myusername]/.ssh/knownhosts"
debug3: recordhostkey: found key type ECDSA in file /Users//{myusername]/.ssh/knownhosts:4
debug3: loadhostkeys: loaded 1 keys from 128.199.240.57
debug3: orderhostkeyalgs: prefer hostkeyalgs: ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521
debug3: send packet: type 20
debug1: SSH2MSG_KEXINIT sent
Connection closed by 128.199.240.57 port 22