Client side GlideRecord callback not working

[snoozer]

I'm working on a UI page. I need to load some values from a table into a slushbucket for users to choose. The problem is that in the callback function, I can not access the GlideRecord object. Here is my code:

function _getAMFEntriesForSlush()
{
    var amfGR = new GlideRecord('u_amf_entry');
    amfGR.query(_amfCallBack);
}

function _amfCallBack(amfGR)
{
     alert("hi" + amfGR);                                      //  I get this alert
     alert("hi " + amfGR.getRowCount());           // I do not get this alert

// none of the following happens
    while (amfGR.next())
	{
        var amfName = amfGR.getValue('u_name');
        var amfID = amfGR.getValue('sys_id');
        amf_slush.addLeftChoice(amfID, amfName);
    }
}

The code to populate the slushbucket never gets run. I put in some alerts to see where the code is failing. I get that first alert, and it says "hi [object Object]". I do not get the second alert, which tells me there's a problem with referencing the GlideRecord object. Why?

What's really frustrating is that I have done this exact thing before and it works perfectly. I copied that code to write this. The other code works, but this doesn't.

Here's a the reference I used about client side GlideRecords:

https://www.servicenow.com/docs/bundle/xanadu-api-reference/page/app-store/dev_portal/API_reference/...

Any help or thoughts would be appreciated. Thanks.

[snoozer · Accepted solution]

I ended up creating a whole new UI Page and copying the code into the new page. It works with no changes. No idea why the previous page didn't work.