The property or field 'Email' has not been initialized. It has not been requested or the request has not been executed. It may need to be explicitly requested.

<SharePoint:ScriptLink name="clienttemplates.js" runat="server" LoadAfterUI="true" Localizable="false"/>
<SharePoint:ScriptLink name="clientforms.js" runat="server" LoadAfterUI="true" Localizable="false"/>
<SharePoint:ScriptLink name="clientpeoplepicker.js" runat="server" LoadAfterUI="true" Localizable="false"/>
<SharePoint:ScriptLink name="autofill.js" runat="server" LoadAfterUI="true" Localizable="false"/>
<SharePoint:ScriptLink name="sp.RequestExecutor.js" runat="server" LoadAfterUI="true" Localizable="false"/>
<SharePoint:ScriptLink name="sp.js" runat="server" LoadAfterUI="true" Localizable="false"/>
<SharePoint:ScriptLink name="sp.runtime.js" runat="server" LoadAfterUI="true" Localizable="false"/>
<SharePoint:ScriptLink name="sp.core.js" runat="server" LoadAfterUI="true" Localizable="false"/>
<SharePoint:ScriptLink name="SP.Debug.js" runat="server" LoadAfterUI="true" Localizable="false"/>
<SharePoint:ScriptLink name="SP.Runtime.Debug.js" runat="server" LoadAfterUI="true" Localizable="false"/>

///////////////////Enable JSOM Intellisense for MS Visual Studio////////////////////////////////////////////////////////////////////////
/// <reference path="C:Program FilesCommon Filesmicrosoft sharedWeb Server Extensions15TEMPLATELAYOUTSclienttemplates.js" />
/// <reference path="C:Program FilesCommon Filesmicrosoft sharedWeb Server Extensions15TEMPLATELAYOUTSclientforms.js" />
/// <reference path="C:Program FilesCommon Filesmicrosoft sharedWeb Server Extensions15TEMPLATELAYOUTSclientpeoplepicker.js" />
/// <reference path="C:Program FilesCommon Filesmicrosoft sharedWeb Server Extensions15TEMPLATELAYOUTSautofill.js" />
/// <reference path="C:Program FilesCommon Filesmicrosoft sharedWeb Server Extensions15TEMPLATELAYOUTSsp.RequestExecutor.js" />
/// <reference path="C:Program FilesCommon Filesmicrosoft sharedWeb Server Extensions15TEMPLATELAYOUTSsp.js" />
/// <reference path="C:Program FilesCommon Filesmicrosoft sharedWeb Server Extensions15TEMPLATELAYOUTSsp.runtime.js" />
/// <reference path="C:Program FilesCommon Filesmicrosoft sharedWeb Server Extensions15TEMPLATELAYOUTSsp.core.js" />
/// <reference path="C:Program FilesCommon Filesmicrosoft sharedWeb Server Extensions15TEMPLATELAYOUTSsp.debug.js" />
/// <reference path="C:ProjectsjqueryVsDocjquery-1.4.4-vsdoc.js" />
//////////////////////////////////////////////////////////////////////////////////////////////////////////
v_item = '';

$(
function () {
    if (typeof (_spBodyOnLoadWrapper) != 'undefined') { _spBodyOnLoadWrapper(); }
ExecuteOrDelayUntilScriptLoaded(getDivision_Chief_User, "sp.js");
});

function getDivision_Chief_User() {
    var clientContext = new SP.ClientContext.get_current();

    var web = clientContext.get_web();

    var list = web.get_lists().getByTitle('myTestList');

    v_item = list.getItemById(1);

    clientContext.load(v_item);

    clientContext.executeQueryAsync(onSuccess, onFailure);
}
function onSuccess(sender, args) {
    var context = SP.ClientContext.get_current();
    var web = context.get_web();
    var userName = v_item.get_item('myPersonLookUpField').get_lookupValue();
    var user = web.ensureUser(userName);

    //ERROR HAPPENS HERE WHEN DEBUGING IN BROWSER

    var email = user.get_email();
    var loginName = user.get_loginName();
    var v_Id = user.get_id();
    var v_Title = user.get_title();

    alert('The Display Name of the user is ' + email);
    alert('The Account Name of the user is ' + loginName);
    alert('The email address of the user is ' + v_Id);
    alert('The User Title is ' + v_Title);

    //$("#h_ValueWritter").html(v_commentsTemp);


}
function onFailure(sender, args) {

    console.log('Failure!');
}