javascript - Getting "TypeError: undefined is not a function" when trying to send email using mailgun -

i trying send email using mailgun , have given code below

parse.cloud.define("sendemail", function(request, response) {      var mailgun = require('mailgun');     mailgun.initialize('domainname', 'myapikey');      mailgun.sendemail({             to: "test@test.com" ,              from: "test@test.com",             subject: "title",             text: "contents"         },{         success: function() {             response.success(request.params);             console.log("--email sent - success");             console.log(request.params);         },         error: function() {              console.log("--failed send email - success");             console.error(request.params);             response.error("uh oh, went wrong");         }     });    }); 

but recieving error typeerror: undefined not function in line parse.cloud.define("sendemail", function(request, response) , not sending email, new mailgun , parse, please assist me, thank in advance

i ran code in own cloudcode instance, , executes fine. post entire main.js file please? there may formatting issue or such.