Java Error on startup after update to 1.2.1

HI, just updated my FAF client to the latest version after being prompted to, unfortunately as soon as i start the client after update i get this error:

java.lang.RuntimeException: Exception in Application init method
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:895)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:195)
at java.base/java.lang.Thread.run(Thread.java:832)
Caused by: java.lang.NoClassDefFoundError: net/brutus5000/bireus/service/PatchEventListener
at java.base/java.lang.Class.getDeclaredConstructors0(Native Method)
at java.base/java.lang.Class.privateGetDeclaredConstructors(Class.java:3215)
at java.base/java.lang.Class.getDeclaredConstructors(Class.java:2435)
at org.springframework.boot.context.properties.ConfigurationPropertiesBindConstructorProvider.findConstructorBindingAnnotatedConstructor(ConfigurationPropertiesBindConstructorProvider.java:62)
at org.springframework.boot.context.properties.ConfigurationPropertiesBindConstructorProvider.getBindConstructor(ConfigurationPropertiesBindConstructorProvider.java:48)
at org.springframework.boot.context.properties.ConfigurationPropertiesBean$BindMethod.forType(ConfigurationPropertiesBean.java:311)
at org.springframework.boot.context.properties.ConfigurationPropertiesBeanDefinitionValidator.validate(ConfigurationPropertiesBeanDefinitionValidator.java:63)
at org.springframework.boot.context.properties.ConfigurationPropertiesBeanDefinitionValidator.postProcessBeanFactory(ConfigurationPropertiesBeanDefinitionValidator.java:45)
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:291)
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:175)
at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:707)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:533)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750)
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:315)
at org.springframework.boot.builder.SpringApplicationBuilder.run(SpringApplicationBuilder.java:140)
at com.faforever.client.FafClientApplication.init(FafClientApplication.java:93)
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:824)
... 2 more
Caused by: java.lang.ClassNotFoundException: net.brutus5000.bireus.service.PatchEventListener
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:602)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
... 21 more

I have tried the following solutions:

• updated java.

• verified all files for Supreme Commander 1 and 2

• disabled antivirus and firewall

• deleted config file (as directed by a google search solution)

• reinstalled and downloaded the FAF client.

needless to say ive done a few things, but continue to receive this error.

if anyone could help that would be great

Thanks.

Looking at the error I am 100% sure that you have leftovers from a previous installation. Uninstall the client and manually delete everything that is left in the installation folder, then reinstall.

I don't know what causes this in the installer, but you are not the first user with this problem

@Brutus5000 Thanks for the help! just did it and fixed!