Can't connect SSL

When I give FTP information for Automatic Verification to SSL For Free I get this error. How to solve it?

Domain "" challenge3 failed. Response from "" was: 

Error: Invalid response from "<html><body><script type="text/javascript" src="/aes.js" ></script><script>function toNumbers(d){var e=[];d.replace(/(..)/g,func"

Full Error: { "type": "http-01", "status": "invalid", "error": { "type": "urn:ietf:params:acme:error:unauthorized", "detail": "Invalid response from \"\\u003chtml\\u003e\\u003cbody\\u003e\\u003cscript type=\"text/javascript\" src=\"/aes.js\" \\u003e\\u003c/script\\u003e\\u003cscript\\u003efunction toNumbers(d){var e=[];d.replace(/(..)/g,func\"", "status": 403 }, "url": "", "token": "yyJUXT0eRk8HW1Zpk2Fx06vOaiDvpgOB7zNPRqXhqBs", "validationRecord": [ { "url": "", "hostname": "", "port": "80", "addressesResolved": [ "" ], "addressUsed": "" } ] }

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