Unity's editor works fine but the built game doesn't work

I'm making my first game in unity 2020.2.1 and in the editors it works perfectly fine but when I build the game and launch it, a screen with the unity logo and an exclamation mark on it pop up and close after 1 second and won't let me test my game, can someone help me?,I'm making my first game in unity 2020.2.1 and in the editors it works perfectly fine but when I build the game and launch it, a screen with the unity logo and an exclamation mark on it pop up and close after 1 second and won't let me test my game