Commented Issue: SPServices.SPComplexToSimpleDropdown - Column not found on page [10037]

Dear All,

jQuery: 1.7.1
SPservices: 0.7.1a
Sharepoint 2007

I'm having an issue with this simple function (even with the SPCascadeDropdown), as I always get the error of Parent Column not found, and I've triple checked the names.

Here is my code:

<script type="text/javascript" src="../../Library/jquery-1.7.1.min.js"></script>
<script type="text/javascript" src="../../Library/jquery.SPServices-0.7.1a.min.js"></script>

<script type="text/javascript">
$().SPServices.SPComplexToSimpleDropdown({
columnName: "Country",
// completefunc: null,
debug: true
});
</script>

And my column name is quite clear, and it's still going wrong.

What could be possibily the issue?

Thanks for your support.
Comments: FYI...happened to me today. User had closed the form's web part on the form's web page. So, I edited the the core.css to hide the site actions menu.