fft_ii_0_example_design_tb.v(101):Instantiation of 'altera_avalon_st_sink_bfm' failed

I tried to generate an Altera FFT core example using Quartus II version 15.

I got the fft_ii_0_example_design_core.vo and fft_ii_0_example_design_tb.v files in the example. (see attachment) But when I try to run the testbench (fft_ii_0_example_design_tb.v) in modelsim, I get the error "fft_ii_0_example_design_tb.v(101): instantiation of 'altera_avalon_st_sink_bfm' failed. the design unit was not found."

So, how do you get it working?