A JSONObject must begin with '{' at character 1 of <!DOCTYPE html>

I am using ADM Import Client 2.5.9 . While I am executing deploy-application.bat -application_path <application_path> -username <username> -password <xxxx> -url <url> command , I am getting an error 

"A JSONObject must begin with '{' at character 1 of <!DOCTYPE html>"

Has anyone encountered such error?

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