after the updated I am no longer able to join any servers

[19:10:53] Server Connector #1/ERROR: Couldn't connect to server
java.lang.NullPointerException: group
at io.netty.bootstrap.AbstractBootstrap.group(AbstractBootstrap.java:80) ~[netty-all-4.0.23.Final.jar:?]
at eo.a(SourceFile:275) ~[1.10.2.jar:?]
at bfa$1.run(SourceFile:59) [1.10.2.jar:?]
[19:11:39] [Client thread/INFO]: Connecting to 192.99.21.100, 25588
[19:11:39] Server Connector #2/ERROR: Couldn't connect to server
java.lang.NullPointerException: group
at io.netty.bootstrap.AbstractBootstrap.group(AbstractBootstrap.java:80) ~[netty-all-4.0.23.Final.jar:?]
at eo.a(SourceFile:275) ~[1.10.2.jar:?]
at bfa$1.run(SourceFile:59) [1.10.2.jar:?]