Read the crash message at the top of the window (the part inside <brackets>).
* Make sure maximum texture size for megatextures (advanced graphics) is more than 256.* Make sure automatic mipmap generation (compatibility) is not disabled.* Make sure your Java version is up to date.* If the crash message mentions jogl.library.path, Check [[reinstallClient Log Messages]] if the clientmessage and a solution is listed.
=== The game crashes without a crash window ===