Modelsim SDF ERROR

[Altera_Forum]

HI, I am using the Modelsim 6.5b for the timing analysis, but when I add the SDO file to the similation, an error occurs showing as follow:Loading instances from E:/FPGA/sin/simulation/modelsim/sin_v.sdo# ** Fatal: SDF files require Altera primitive library. 

 I am using Verilog HDL, and this error never occurs to my teammate who is using VHDL.   THANKS FOR HELP!!!

[Altera_Forum]

it says that it requires altera's primitive library. try adding the library into the vsim when doing simulation: 

 vsim -L altera_ver work.<your top level test bench>