Solved We have a big error here?

Start with offering us more information such as what operating system are you using, if you're running the game in full screen or not, if you're running any maphack or not and any other useful information that may help us to find more about your problem. You cannot downgrade from 1.14 so most likely you failed to follow the connect instructions from http://europebattle.net/d2/join
Also make sure to check http://forum.europebattle.net/threads/fix-diablo-ii-common-errors.532466/

 

The game is corrupted somehow, reinstall it and make sure it's 1.13c not 1.14 as the battlenet web installer will automatically upgrade to latest version and you won't be able to downgrade it. Optionally, you may get the full archived client from http://forum.europebattle.net/threads/diablo-ii-client-maphack-autoteleport-glide.531601/