Error (129037): Output port OUTCLK on atom "ddr_0002:ddr_inst|ddr_pll0:pll0|uphy_clkbuf_memphy", which is a stratixv_phy_clkbuf primitive, is driving one or more illegal destinations。
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May I know which Quartus version are you using? Is it v14.1? We had a similar quartus error reported in the past when using Quartus v14.1.
Can you try to run the design in Quartus 14.0.2 or v13.0 , check if the failure is reproduce-able?
If you still encounter similar issue, it possible to get your design so that I can debug it from my side or maybe you can provide the steps to reproduce the error?
Let me know your feedback.