I have a local server that runs on my Son's mac - it is version 1.10.2, I did not do anything fancy to it beyond install it. My son then connects his client (also at 1.10.2) to this server and my daughter uses her pc to connect her client (also 1.10.2). They have been playing this way for many months.
Today the new version installed on both their machines. I started up the server on the mac and it seemed fine. My daughter's PC can connect to the server and she can play. However on the mac (same machine as the server) I get "Failed to connect to the server" Internal Exception: java.lang.NullPointerException.
How do I fix this? I have tried rebooting the mac and that did not help. This only started happening after the new version of minecraft installed and yes I did make sure I was running the client at 1.10.2 when we launched it.
a frustrated Mom
Why are you hosting a server like this? Just use a lan world! Much less challenging.