RepeatedCrashing when trying to open hearthfire

[yeahok]

Every time I try to access my hearthfire I crash and receive this message. Can anyone help me diagnose the problem? I am using Ender client, most up-to-date Nvidia drivers and Java version available, Intel CPU and 970 GPU. Thanks in advance.

java.lang.NoClassDefFoundError: haven/SSearchBox
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source)
at haven.Resource$CodeEntry$1$1.findClass(Resource.java:1381)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at haven.Resource$CodeEntry.getentry(Resource.java:1407)
at haven.Resource$CodeEntry.get(Resource.java:1439)
at haven.Resource.getcode(Resource.java:1288)
at haven.Widget.gettype2(Widget.java:210)
at haven.UI.newwidget(UI.java:245)
at haven.RemoteUI.run(RemoteUI.java:65)
at haven.MainFrame.uiloop(MainFrame.java:287)
at haven.MainFrame.run(MainFrame.java:303)
at haven.MainFrame.main2(MainFrame.java:451)
at haven.MainFrame.lambda$main$0(MainFrame.java:487)
at java.lang.Thread.run(Unknown Source)
Caused by: haven.Resource$ResourceClassNotFoundException: Could not find class haven.SSearchBox in resource ui/maillist(v1)
at haven.Resource$CodeEntry$1$1.findClass(Resource.java:1380)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 17 more

[loftar]

java.lang.NoClassDefFoundError: haven/SSearchBox

Looks like you're using a client that hasn't been updated since January or so.