This error occurs when you generate the Triple Speed Ethernet® IP with simulation enabled and you have installed Quartus® II with only a limited set of devices. For example, only Arria® II GX device support has been installed.
To workaround this error, you can simply re-install Quartus II ensuring that all device famlies are installed. Then regenerate the Triple Speed Ethernet IP.
This problem will be fixed in a future version of the Quartus II software.