Modelsim Altera problems

Hello, my friends,

Let me include more information about the situation.

After I compiled my test bench file fir_fft_two_tb.vht (exported from quartus ii), in the library it appears as three entity and one package (please see attachment), I really have no clue which one I should choose; hence I chose one by one to load the design.

when I loaded the first file fir_fft_two_vhd_check_tst, the result is shown in simulate_1.jpg

when I loaded the second file fir_fft_vhd_sample_tst, the result is shown in simulate_2.jpg

It didn't allow me to loaded the third file fir_fft_vhd_tb_types, hence I guess this one is not in use

Finally it says "error loading design" when I tried to load the last file fir_fft_vec_tst.

None of them worked, as you can see in my attachment, seems every signal is undefined! How could this be? Why is it totally different from the waveform I made inside quartus ii?

Please give some advice, I am going nuts here... Thank you so much!