Go to your .minecraft folder (Windows+R, write %appdata%, open .minecraft), open crash-reports folder, copy-paste the file with the date and time of the crash on this post.
Go to your .minecraft folder (Windows+R, write %appdata%, open .minecraft), open crash-reports folder, copy-paste the file with the date and time of the crash on this post.
Go to your minecraft folder (should be /Library/Application Support/minecraft/ on Mac), open crashreports folder, copy-paste the file with the date and time of the crash on this post.
Go to your minecraft folder (should be /Library/Application Support/minecraft/ on Mac), open crashreports folder, copy-paste the file with the date and time of the crash on this post.
Wait a sec.... what is 1.6.4? It's not written on the wiki, forums, mojang's website...