Email is not defined(…) ReferenceError: Email is not defined

[neutron92]

Meteor.methods({
autoFormCreateUser: function (formDoc) {     

       this.unblock();

        Email.send({
        to: 'hichemchouaibi2@gmail.com',
        from: "from",
        subject: "subject",
        text: "text"
        });
//... other code
 }

this code is Written in user collection file

i have this error

Exception while simulating the effect of invoking 'autoFormCreateUser' ReferenceError: Email is not defined(…) ReferenceError: Email is not defined