I was importing some assets for my project and when I was going to import Standard Asset unity crashed and I couldn’t open the project anymore because it crashed bug. Sorry my English is bad. Please help me
Hi there - could you please confirm which version of Standard Assets you are trying to import? It sounds like you might be loading it into a version of the editor that it is not intended for.
Screenshots would be very helpful 
problem fixed here : Unity Standard Assets 2020 | Fixing standard assets error - YouTube