FPS game compiler error,FPS game compiler error

I just downloaded unity today and was trying to pull up their FPS game on learn. When trying to run anything I get a error pop-up saying "All compiler errors must be fixed before you can enter game mode". It also says my GUID is not valid in console. If you know how to fix this please let me know. Thank you. ,I just downloaded unity today and was trying to pull up their FPS game walkthrough as my first game on learn. However, when I try running anything I see a pop up that says, "All compiler errors must be fixed before you can enter game mode". I tried reinstalling, running as administrator, and opening a blank program but the problem continued. If you know how to fix this please let me know. Thank you.