ruby on rails - Net::HTTPBadResponse (wrong status line: "<html>") -

i using active admin save email templates. using mail gun send emails.

the whole process works absolutely fine if define email boday text such as:

body = "this text in email"

if attempt use template made in active admin so:

body = load_rendered_template("new_quote_email")

i error: wrong status line: '<html>'

the app using ssl have it? same error both in production , development.

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