If you move the directory containing your Quartus II project, or rename your Quartus II project and recompile it without regenerating the DDR or DDR2 SDRAM Controller, you may receive the following error:
Error: DDR timing cannot be verified until project has been successfully compiled.
This error indicates that some of the settings files contain references to the previous location or project name and the verify timing script is unable to find the current project.
This issue affects all configurations.
The timing script does not verify your design.