Migration Issues from D6 to D7.

Hello,

I have migrated a application based portal from D6 to D7. Now If I disable view_reference, I get error "view_plugin_display not found" & If I enable it, I get "member function get_option() on a non-object in view.inc on line 2481".

I can't understand the reason behind it. Can anybody help ?

Thanks,
RajeevK