how to Simulate Nios II with custom component?

Thanks ted for your nice reply, my problem solved. but i think I have fundamental problem.

My end objective is to simulate the whole SoC sistem on Modelsim. It means that C code running on the Nios processor should talk to my custom hardware component. So far I know how to talk to my component (using SystemVerilog OOP programming in the testbench) and in another tutorial I also learned how to simulate the Nios behavior running C code.

But as I mentioned I need to talk to my component through C code running on Nios, Something exactly like this tutorial but in simulation:

https://www.youtube.com/watch?v=ajyyi12yio4

when I simulate this youtube tutorial I get this error:

Loading nios2_inst_altpll_locked_conduit_bfm.altera_conduit_bfm_0002

# Error loading design

I tried to export PLL_conduits but it didnt work.Do I need any other component in my Qsys system?Attached file is my Qsys system.

thanks.https://www.alteraforum.com/forum/attachment.php?attachmentid=9948