Site Prefix issue in Visual Force for Communities

HI ,

I am deploying some code from sandbox which was developed by another developer. I deopled everything and one visual force page is not working and it gives me an error saying Page error occured while loading page . And this same page works in my sandbox and both the codes are exact same . Am wondering if i missed anything while deployment .

Here is peice of code which needs to work for Opening up the Visual force page.

<span><a href="javascript:void(0)" 
                                            onclick="openProductDetailModal('{!$Site.Prefix}/apex/CCMTY_OrderProductDetailModal?id={!orderItem.PricebookEntry.Product2Id}&pricebookEntryId={!orderItem.PricebookEntryId}');">
                                            {!orderItem.PricebookEntry.Product2.Name}
                                            </a>
                                        </span>


function openProductDetailModal(url){
        $("#productDetailModal .modal-body").html('<iframe width="100%" height="750" id="upload_file" frameborder="0" scrolling="no" allowtransparency="true" src="'+url+'"></iframe>');
        $('#productDetailModal').modal('show');
    }

Exact same code in both sandboxes and checked profile permissions and object permissions . everything exactly same . Any insight please

Thanks
G