Client crash when loading

So I stopped playing months ago after I downloaded a new update and keep receiving this error message

java.lang.NoClassDefFoundError: com/google/gson/ExclusionStrategy
at com.faforever.client.FafClientApplication.applicationMain(FafClientApplication.java:72)
at com.faforever.client.Main.main(Main.java:13)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at com.exe4j.runtime.LauncherEngine.launch(LauncherEngine.java:84)
at com.exe4j.runtime.WinLauncher.main(WinLauncher.java:94)
at com.install4j.runtime.launcher.WinLauncher.main(WinLauncher.java:25)
Caused by: java.lang.ClassNotFoundException: com.google.gson.ExclusionStrategy
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:606)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:168)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
... 9 more

any idea what this is and how to fix it? never had this message on the previous versions and suddenly after the new update, i get this.

Many Thanks

@Cyphers try uninstalling and reinstalling the client

Make sure to manually delete the installation directory entirely

@Rowey i remember quite a few people complaining about the same issue with the 1.15 update. might be why a lot of people stopped playing shrugs