Using @ManagedBean annotation.....com.sun.faces.config.ConfigurationException: CONFIGURATION FAILED! null. Can you help me somebody pls?

I am starting with PrimeFaces and I have issue by my first attempt to use it :/. When I add @ManagedBean annotation in my ItemService class, mentioned error occures com.sun.faces.config.ConfigurationException: CONFIGURATION FAILED! null. Can you help me somebody pls?

SEVERE: Critical error during deployment: com.sun.faces.config.ConfigurationException: CONFIGURATION FAILED! null at com.sun.faces.config.ConfigManager.initialize(ConfigManager.java:377) at com.sun.faces.config.ConfigureListener.contextInitialized(ConfigureListener.java:223) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4992) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5492) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1575) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1565) at java.util.concurrent.FutureTask.run(Unknown Source) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source) Caused by: java.lang.NullPointerException at com.sun.faces.application.annotation.ManagedBeanConfigHandler.collectAnnotatedFields(ManagedBeanConfigHandler.java:246) at com.sun.faces.application.annotation.ManagedBeanConfigHandler.collectAnnotatedFields(ManagedBeanConfigHandler.java:263) at com.sun.faces.application.annotation.ManagedBeanConfigHandler.getBeanInfo(ManagedBeanConfigHandler.java:155) at com.sun.faces.application.annotation.ManagedBeanConfigHandler.process(ManagedBeanConfigHandler.java:141) at com.sun.faces.application.annotation.ManagedBeanConfigHandler.push(ManagedBeanConfigHandler.java:127) at com.sun.faces.application.annotation.AnnotationManager.applyConfigAnnotations(AnnotationManager.java:200) at com.sun.faces.config.processor.AbstractConfigProcessor.processAnnotations(AbstractConfigProcessor.java:326) at com.sun.faces.config.processor.ManagedBeanConfigProcessor.process(ManagedBeanConfigProcessor.java:244) at com.sun.faces.config.processor.AbstractConfigProcessor.invokeNext(AbstractConfigProcessor.java:114) at com.sun.faces.config.processor.ValidatorConfigProcessor.process(ValidatorConfigProcessor.java:120) at com.sun.faces.config.processor.AbstractConfigProcessor.invokeNext(AbstractConfigProcessor.java:114) at com.sun.faces.config.processor.ConverterConfigProcessor.process(ConverterConfigProcessor.java:126) at com.sun.faces.config.processor.AbstractConfigProcessor.invokeNext(AbstractConfigProcessor.java:114) at com.sun.faces.config.processor.ComponentConfigProcessor.process(ComponentConfigProcessor.java:117) at com.sun.faces.config.processor.AbstractConfigProcessor.invokeNext(AbstractConfigProcessor.java:114) at com.sun.faces.config.processor.ApplicationConfigProcessor.process(ApplicationConfigProcessor.java:340) at com.sun.faces.config.processor.AbstractConfigProcessor.invokeNext(AbstractConfigProcessor.java:114) at com.sun.faces.config.processor.LifecycleConfigProcessor.process(LifecycleConfigProcessor.java:116) at com.sun.faces.config.processor.AbstractConfigProcessor.invokeNext(AbstractConfigProcessor.java:114) at com.sun.faces.config.processor.FactoryConfigProcessor.process(FactoryConfigProcessor.java:222) at com.sun.faces.config.ConfigManager.initialize(ConfigManager.java:362) ... 10 more