Unity can't build and run

Hello! Today i made a game, everything was working fine. Then when i tried to build it, there was only windows error sound, later i couldn’t move my character. Unity 2020

Hi, First of all Unity 2020 is in Beta, Expect any error, problem.
Second you should post the error or the screenshot so we can understand the problem
Be sure you have netframe work 4.7.2 developer pack
Be sure you have visual-redist 2013
Try Unity 2019