adding link to datatable

[henry]

hi guys am having some issues my code any help will do,am trying to add a
link to my datatable 
firstly i created the DetailPage class

//DetailPage class code
public DetailsPage(String id , IModel entryModel) {
        super(id,entryModel);

        Link link = new Link("link"){
            @Override
            public void onClick() {
                showDetails details = new showDetails(getEntry());
                setResponsePage(details);
            }
        };
   
        add(new Label("id",getEntry().getId()+""));
        add(link);
    }

    private PhoneTransferRequest getEntry(){
        return (PhoneTransferRequest)getDefaultModelObject();
    }

and i try adding the DetailPage panel to my datatable

IColumn[]columns = {new AbstractColumn<PhoneTransferRequest>(new
Model<String>("id")) {
        public void populateItem(Item cellItem, String componentId, IModel
rowModel)
        {
            cellItem.add(new DetailsPage(componentId, rowModel));
        }
        },
        new
ExportablePropertyColumn<PhoneTransferRequest>(Model.of("Initiator"),
"customerId" ),
        new
ExportablePropertyColumn<PhoneTransferRequest>(Model.of("StartTime"),
"startTime" ),
        new
ExportablePropertyColumn<PhoneTransferRequest>(Model.of("switchResponse"),
"switchResponse"),
        new
ExportablePropertyColumn<PhoneTransferRequest>(Model.of("SourceAccount"),
"sourceAccount"),
        new
ExportablePropertyColumn<PhoneTransferRequest>(Model.of("DestAccount"),
"destAccount"),
        new
ExportablePropertyColumn<PhoneTransferRequest>(Model.of("Amount"),
"amount"),
        new
ExportablePropertyColumn<PhoneTransferRequest>(Model.of("Notication"),
"notificationSent"),};

        //creating dataTable object
        DefaultDataTable dataTable1 = new
DefaultDataTable("datatable",columns,new PhoneTransferProvider(),30);

any time i run this code i get

an INTERNAL ERROR MESSAGE.

please i need to get this sorted out today.

Regards

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