Error while uploading files

When I uploading files in my website for FileZilla I got this error message
Response: 421 3900 users (the maximum) are already logged in, sorry
Error: Could not connect to server

and for cPanel->Online File Manager I got this

Unable to connect to FTP server on port 21 .

Are you sure this is the address of the FTP server? This is often different from that of the HTTP (web) server. Please contact your ISP helpdesk or system administrator for help.

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