DDR2 Fitter(Place & Route) report errors

Have you checked the pin assignments in the Memory generator (ALTMEMPHY). Make sure the pin assignments do not conflict with other pin assignments in your project/board. I guess, you also need to choose a memory vendor aka Micron/Samsung/etc from the Memory vendor list so that you are targeting the correct memory chip. Each chip has its own timing parameters so be careful in selecting the vendor and chip carefully from the supported memory list.

Another way is to remove all pin location assignment for DDR2 pin and perform full compilation. Quartus will auto fit those pin accordingly that apply with the requirement. Then review the fitter report and compare it to your manual pin assignment.