Unexpected file format errors

![15982061777358060550263138061880|375x500](upload://7hfFh51Lvorji5oAQfxXzjKC8aK.jpeg
when am working with my gated community design, iam working on sketch up 2020… i save my file to 2020 .after a few hours later iam trying to open my file but suddenly the message on the display " unexpected file format" …i dont know what to do…can u help me guyzz…the file is 106 MB