I am unable to login to FileZilla

Hi,
I was previously logged into FileZilla, but can no longer gain access.

See error below:

Status: Connecting to hpc-transfer1.usc.edu…
Status: Using username nathanwi.
Error: FATAL ERROR: No supported authentication methods available (server sent: publickey)
Error: Could not connect to server
Status: Waiting to retry…
Status: Connecting to hpc-transfer1.usc.edu…
Response: fzSftp started, protocol_version=11
Command: open nathanwi@hpc-transfer1.usc.edu 22
Status: Using username nathanwi.
Error: FATAL ERROR: No supported authentication methods available (server sent: publickey)
Error: Could not connect to server