DirectMethod is not getting called, Ext js 3.4 - extjs

Question

I am very new to EXTJS. I am using 3.4 version which is old one.
Have defined the controller and Use DirectMethod for combo box value fill up.
But controller's direct method in not being called.
My Code below
public class Controller { //Controller to fetch the data
#DirectMethod
public String fetchData() {
System.out.println("Controller");
ArrayList < ComboDataVo > da = null;
Dao dao = new Dao();
try {
da = dao.retrieveUserData();
} catch (Exception e) {
e.printStackTrace();
}
System.out.println("In Controller.................");
Gson gson = new GsonBuilder().serializeNulls().create();
System.out.println("Data: " + gson.toJson(da));
return gson.toJson(da);
}
}
Main js
Ext.onReady(function() {
//Menu
new Ext.Toolbar({
renderTo: document.body,
items: [{
xtype: 'tbbutton',
text: 'Button',
helpfile: 'director',
handler: Movies.showHelp
}, {
xtype: 'tbfill'
}, {
xtype: 'tbseparator'
}, {
xtype: 'tbbutton',
text: 'Menu Button',
menu: [{
text: 'Panel1'
}, {
text: 'Panel2'
}]
}]
})
//Form
Ext.QuickTips.init();
var movie_form = new Ext.FormPanel({
renderTo: document.body,
frame: true,
width: 800,
collapsible: true,
title: 'Movie Information',
items: [{
xtype: 'checkbox',
name: 'mtype',
fieldLabel: 'Horror Movie'
}, {
fieldLabel: 'Local Data',
xtype: 'combo',
name: 'genre',
mode: 'local',
store: dstore, // Calling this one for the Combo data
displayField: 'user_id'
}, {
xtype: 'textarea',
fieldLabel: 'Decription',
anchor: '100%',
maxLength: 5
}, {
fieldLabel: 'extra Comments',
xtype: 'htmleditor',
anchor: '100%'
}, {
xtype: 'panel',
title: 'Panel',
layout: 'border',
collapsible: true,
items: [{
xtype: 'textfield',
fieldLabel: 'PanelTextBox1',
name: 'panelTxt1',
region: 'west'
}, {
xtype: 'textfield',
fieldLabel: 'PanelTextBox2',
name: 'panelTxt2',
region: 'south'
}]
}]
});
});
//Data Store js
var dstore = new Ext.data.Store({
reader: new Ext.data.JsonReader({
fields: ['user_id', 'emp_no']
}),
proxy: {
type: 'direct',
directFn: 'Controller.fetchData'
},
autoLoad: true
});
Can someone please help me on this?
Appreciate your help!
Thanks,
Dhaval