Received error message during compilation

Your Quartus project must be looking at this file as the top-level entity instead of the actual top-level. Two things to do:

1) Open your actual top-level design (guessing it's ps_control.vhd) and set it as the top-level entity using the option near the bottom of the Project menu in Quartus. Make sure you see the top-level entity name as ps_control in the project hierarchy in the Project Navigator.

2) Go to Project menu -> Add/remove files and remove the _tb file from your Quartus project file list.

I'm guessing you saved this _tb file in the Quartus project directory. Quartus will use any design files in this directory for compilation automatically so you don't have to add them manually to the project, so it might be best to put simulation-related files in a different directory.

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