Internal Exception: java.lang.NullPointerEcxeption

First: I apologize for my bad English. I am a German player who can not speak English very well. : D

My problem is: I can not connect to any server (eg the server "rewinside.net"). I've got this problem since the new design of the Minecraft Launcher. I do not know what to do. I play on the server with minecraftversion 1.10 and that was not a problem so far. But now I always get the message "InternalException: java.lang.NullPointerException"

Please help me, I would like to play Bed Wars again