Did I need to set a proper pin assignment if I running a simulation ?

RTL simulation is used to check your design functionality. Pin assignment is not required. You only need to run the Analysis and Synthesis successfully.

You may try the example design provided in the user guide to further understand the simulation flow.

https://www.intel.com/content/www/us/en/docs/programmable/691278/21-3/quick-start.html

Additionally, could you file a new forum case for your follow up question on the compilation error message?

This is for tracking purpose. Btw, the screenshot resolution is too low to view.

Regards,

Richard Tan