The Quartus® II software version 8.1 and 9.0 incorrectly generates this error messages when VCCA_L/R is set to 2.5V for transceiver input reference clock frequencies of greater than 637.5MHz. This happens even if CMU PLL or the RX CDR data rate is less than or equal to 4.25Gbps.
Altera recommends you to install Patch 0.13 for the Quartus II software version 9.0 to fix this problem. Install the appropriate patch from the link below and compile your design.
For Windows (exe readme.txt):
Patch 0.13 for Quartus II 9.0 Windows.zip
Patch 0.13 for Quartus II 9.0 Linux.tar
Patch 0.13 for Quartus II 9.0 Linux (readme.txt)
This problem is scheduled to be fixed in a future version of the Quartus II software.