Hiya, @EpicGamingGamin, and welcome to the Replit Ask community! I think the problem is that you do not have chromium installed. However, please send the error message so we can get to the bottom of the problem.
To fix this, try opening replit.nix (it’s at the bottom of your files), and then adding pkgs.chromium into the deps list. So, it should look something like this or the like: