JBoss does not boot with jboss-logmanager-ecs-formatter configured

I have JBoss 7.4.15.

I've added the module as the documentation suggested:

modules/co/elastic/logging/main/module.xml
```xml

```

standalone/configuration/standalone.xml
```xml



```

JBoss won't boot:
```
05:58:44,002 ERROR [org.jboss.as.controller.management-operation] (Controller Boot Thread) WFLYCTL0013: Operation ("add") failed - address: ([("subsystem" => "logging")]): java.lang.IllegalArgumentException: Failed to instantiate class "co.elastic.logging.jboss.logmanager.EcsFormatter" for formatter "ECS"
at org.jboss.logmanager.config.AbstractPropertyConfiguration$ConstructAction.lambda$validate$2(AbstractPropertyConfiguration.java:122)
at org.jboss.logmanager.config.WrappedAction.execute(WrappedAction.java:47)
at org.jboss.logmanager.config.AbstractPropertyConfiguration$ConstructAction.validate(AbstractPropertyConfiguration.java:118)
at org.jboss.logmanager.config.LogContextConfigurationImpl.doPrepare(LogContextConfigurationImpl.java:336)
at org.jboss.logmanager.config.LogContextConfigurationImpl.prepare(LogContextConfigurationImpl.java:289)
at org.jboss.as.logging.logmanager.ConfigurationPersistence.prepare(ConfigurationPersistence.java:299)
at org.jboss.as.logging.LoggingOperations$CommitOperationStepHandler.lambda$execute$0(LoggingOperations.java:131)
at org.jboss.as.controller.AbstractOperationContext.executeStep(AbstractOperationContext.java:1063)
at org.jboss.as.controller.AbstractOperationContext.processStages(AbstractOperationContext.java:784)
at org.jboss.as.controller.AbstractOperationContext.executeOperation(AbstractOperationContext.java:470)
at org.jboss.as.controller.OperationContextImpl.executeOperation(OperationContextImpl.java:1430)
at org.jboss.as.controller.ModelControllerImpl.boot(ModelControllerImpl.java:559)
at org.jboss.as.controller.AbstractControllerService.boot(AbstractControllerService.java:546)
at org.jboss.as.controller.AbstractControllerService.boot(AbstractControllerService.java:508)
at org.jboss.as.server.ServerService.boot(ServerService.java:462)
at org.jboss.as.server.ServerService.boot(ServerService.java:415)
at org.jboss.as.controller.AbstractControllerService$1.run(AbstractControllerService.java:447)
at java.lang.Thread.run(Thread.java:750)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at org.jboss.logmanager.config.AbstractPropertyConfiguration$ConstructAction.lambda$validate$2(AbstractPropertyConfiguration.java:120)
... 17 more
Caused by: java.lang.NoClassDefFoundError: java/util/logging/LogManager
at co.elastic.logging.jboss.logmanager.EcsFormatter.getProperty(EcsFormatter.java:127)
at co.elastic.logging.jboss.logmanager.EcsFormatter.(EcsFormatter.java:48)
... 22 more
Caused by: java.lang.ClassNotFoundException: java.util.logging.LogManager from [Module "co.elastic.logging" from local module loader @56cbfb61 (finder: local module finder @1134affc (roots: /aplicacions/jboss/modules,/aplicacions/jboss/modules/system/layers/base))]
at org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:255)
at org.jboss.modules.ConcurrentClassLoader.performLoadClassUnchecked(ConcurrentClassLoader.java:410)
at org.jboss.modules.ConcurrentClassLoader.performLoadClass(ConcurrentClassLoader.java:398)
at org.jboss.modules.ConcurrentClassLoader.loadClass(ConcurrentClassLoader.java:116)
... 24 more
```

Please help me, is there anything more to add to the module definition?
Thanks