Unable to load game today

[DirtCobain]

Hey guys, I'm unable to load the game today with the following java error
I get this error as soon as I tried to run the hafen.jar file
Windows 10 machine, i7 chip, nvidia graphics. Graphic drivers and java both current versions
Client opened fine last time I tried, a few days ago. But today I get this error instantly when I try to open it.
Nothing has changed on my pc since it was last working.

1.00.91.72434924
Windows 10 10.0 x64, 1.8.0_201 amd64
null

java.lang.NoClassDefFoundError: com/google/common/flogger/FluentLogger
at haven.DefSettings.<clinit>(DefSettings.java:40)
at haven.MainFrame.main2(MainFrame.java:348)
at haven.MainFrame.access$100(MainFrame.java:47)
at haven.MainFrame$7.run(MainFrame.java:387)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: com.google.common.flogger.FluentLogger
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 5 more

[MagicManICT]

See here about pointers to an effective request for technical assistance: viewtopic.php?f=47&t=39954

[DirtCobain]

See here about pointers to an effective request for technical assistance: viewtopic.php?f=47&t=39954

I apologise. Which part did I get wrong? Do I just need to add more information? Or did I post in the wrong section?
I've already tried all the trouble shooting points in the thread you linked.

[pawnchito]

Weird you would just stop working. Are you using a custom client?

[MagicManICT]

If this is an issue with a custom client, be sure you take it up with the creator or that it's reproduceable with the standard client. If there is more information, be sure to post all available information. There can be extra tabs in the crash report. Be sure to post the content of those, too.

[DirtCobain]

Not really sure what the problem was, but it's started working again

[Ardennesss]

Custom client issue, his launcher was out of date.

[Granger]

Not a bug, custom client issue.