I created a brand new variation in 10 sp1 and still get this error. I followed the instructions provided by the megawizard to the letter... except to set the top-level entity in the project to ddr3_ip_example_top. Why would I want to do that if I am instantiating the design in my top-level?
From the DDR Megawizard generator
Info: Generating the Example Design.
Info: Generating the Pin Planner file.
Info: Generating the Synopsys Design Constraints file for the example top level.
Info: Generating the Synopsys Design Constraints file.
Info: Generating the Timing Report script.
Info: Generating the ALTPLL Megafunction instance.
Info: Generating the ALTMEMPHY Megafunction instance.
Info: Generating the Functional Simulation Model for ALTMEMPHY
Info: Before compiling your variation in Quartus II, you should follow these steps:
Info: - Enable TimeQuest under Settings, Timing Analysis Settings.
Info: - Add the ddr3_ip_phy_ddr_timing.sdc file to your Quartus II project.
Info: - Add I/O Standard assignments by running the ddr3_ip_pin_assignments.tcl script.
Info: - Set the Default I/O standard to match the memory interface I/O standard setting.
Info: - Turn on Optimize multi-corner timing in the Quartus II Fitter Settings.
Info: - Please make sure that address/command pins are placed on the same edge as the CK/CK# pins.
Info: - Set the top level entity of the project to ddr3_ip_example_top.
Info: See the User Guide for more details.