Problem in accessing REST API through javascript in sp2013

I am trying to access list items the list items through REST in javascript. I use following code:

<input onclick="Call()" name="Button1" type="button" value="button" /><script type="text/javascript" src="../SiteAssets/Scripts/jquery.js"></script><script type="text/javascript" src="../SiteAssets/Scripts/jquery-1.7.2.js"></script><script type="text/javascript" src="../SiteAssets/Scripts/jquery-1.7.2.min.js"></script><script  type="text/javascript"> 
function test()
{

}                
ExecuteOrDelayUntilScriptLoaded(test,'sp.js');
</script><script >
function Call()
{
var appweburl = 'https://microsoft.sharepoint.com/teams/CCG_Tier2_Support';

var executor = new SP.RequestExecutor(appweburl);
                executor.executeAsync(
                    {
                        url:
                            appweburl +"/_api/SP.AppContextSite(@target)/web/lists?@target='" +
                            'RESTDemo' + "'",
                        method: "GET"}
                );



}
jQuery.ajax({
url: 'https://microsoft.sharepoint.com/teams/CCG_Tier2_Support',
type: 'GET'
})

I have inherited the page from default master page.

Here I am getting an error that object does not support thi property when try to access SP.RequestExecutor().

Can someone tell me the problem?