what does these error messages mean?

[stillgreat]

I've tried to install Alfresco and got
HTTP Status 404 - /alfresco/

type Status report

message /alfresco/

description The requested resource (/alfresco/) is not available.
Apache Tomcat/5.5.20

all the time

I looked at the alfresco.log
it says

11:07:24,094 ERROR [org.alfresco.repo.content.transform.magick.AbstractImageMagickContentTransformer] ImageMagickContentTransformer not available: Failed to execute command: convert /opt/alfresco/tomcat/temp/Alfresco/ImageMagickContentTransformer_init_source_36811.gif  /opt/alfresco/tomcat/temp/Alfresco/ImageMagickContentTransformer_init_target_36812.png11:07:26,872 WARN  [org.springframework.remoting.rmi.RmiRegistryFactoryBean] Could not detect RMI registry - creating new one11:07:27,031 ERROR [org.springframework.web.context.ContextLoader] Context initialization failedorg.springframework.beans.factory.BeanCreationException: Error creating bean with name 'registry' defined in class path resource [alfresco/core-services-context.xml]: Initialization of bean failed; nested exception is java.rmi.server.ExportException: Port already in use: 50500; nested exception is:        java.net.BindException: Address already in usejava.rmi.server.ExportException: Port already in use: 50500; nested exception is:        java.net.BindException: Address already in use        at sun.rmi.transport.tcp.TCPTransport.listen(TCPTransport.java:243)        at sun.rmi.transport.tcp.TCPTransport.exportObject(TCPTransport.java:178)        at sun.rmi.transport.tcp.TCPEndpoint.exportObject(TCPEndpoint.java:382)        at sun.rmi.transport.LiveRef.exportObject(LiveRef.java:116)        at sun.rmi.server.UnicastServerRef.exportObject(UnicastServerRef.java:180)        at sun.rmi.registry.RegistryImpl.setup(RegistryImpl.java:92)        at sun.rmi.registry.RegistryImpl.<init>(RegistryImpl.java:78)        at java.rmi.registry.LocateRegistry.createRegistry(LocateRegistry.java:186)        at org.springframework.remoting.rmi.RmiRegistryFactoryBean.getRegistry(RmiRegistryFactoryBean.java:225)        at org.springframework.remoting.rmi.RmiRegistryFactoryBean.getRegistry(RmiRegistryFactoryBean.java:200)        at org.springframework.remoting.rmi.RmiRegistryFactoryBean.getRegistry(RmiRegistryFactoryBean.java:164)        at org.springframework.remoting.rmi.RmiRegistryFactoryBean.afterPropertiesSet(RmiRegistryFactoryBean.java:135)        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1059)        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:363)        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:226)        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:147)        at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:269)        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:320)        at org.springframework.web.context.support.AbstractRefreshableWebApplicationContext.refresh(AbstractRefreshableWebApplicationContext.java:134)        at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:246)        at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:184)        at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:49)        at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3763)        at org.apache.catalina.core.StandardContext.start(StandardContext.java:4211)        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:759)        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:739)        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:524)        at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:809)        at org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:698)        at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:472)        at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1122)        at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:310)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1021)        at org.apache.catalina.core.StandardHost.start(StandardHost.java:718)        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1013)        at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:442)        at org.apache.catalina.core.StandardService.start(StandardService.java:450)        at org.apache.catalina.core.StandardServer.start(StandardServer.java:709)        at org.apache.catalina.startup.Catalina.start(Catalina.java:551)        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)        at java.lang.reflect.Method.invoke(Method.java:585)        at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:294)        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:432)Caused by: java.net.BindException: Address already in use        at java.net.PlainSocketImpl.socketBind(Native Method)        at java.net.PlainSocketImpl.bind(PlainSocketImpl.java:359)        at java.net.ServerSocket.bind(ServerSocket.java:319)        at java.net.ServerSocket.<init>(ServerSocket.java:185)        at java.net.ServerSocket.<init>(ServerSocket.java:97)        at sun.rmi.transport.proxy.RMIDirectSocketFactory.createServerSocket(RMIDirectSocketFactory.java:27)        at sun.rmi.transport.proxy.RMIMasterSocketFactory.createServerSocket(RMIMasterSocketFactory.java:333)        at sun.rmi.transport.tcp.TCPEndpoint.newServerSocket(TCPEndpoint.java:622)        at sun.rmi.transport.tcp.TCPTransport.listen(TCPTransport.java:231)        … 45 more11:07:27,035 ERROR [org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/alfresco]] Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListenerorg.springframework.beans.factory.BeanCreationException: Error creating bean with name 'registry' defined in class path resource [alfresco/core-services-context.xml]: Initialization of bean failed; nested exception is java.rmi.server.ExportException: Port already in use: 50500; nested exception is:        java.net.BindException: Address already in usejava.rmi.server.ExportException: Port already in use: 50500; nested exception is:        java.net.BindException: Address already in use        at sun.rmi.transport.tcp.TCPTransport.listen(TCPTransport.java:243)        at sun.rmi.transport.tcp.TCPTransport.exportObject(TCPTransport.java:178)        at sun.rmi.transport.tcp.TCPEndpoint.exportObject(TCPEndpoint.java:382)        at sun.rmi.transport.LiveRef.exportObject(LiveRef.java:116)        at sun.rmi.server.UnicastServerRef.exportObject(UnicastServerRef.java:180)        at sun.rmi.registry.RegistryImpl.setup(RegistryImpl.java:92)        at sun.rmi.registry.RegistryImpl.<init>(RegistryImpl.java:78)        at java.rmi.registry.LocateRegistry.createRegistry(LocateRegistry.java:186)
at org.springframework.remoting.rmi.RmiRegistryFactoryBean.getRegistry(RmiRegistryFactoryBean.java:225)        at org.springframework.remoting.rmi.RmiRegistryFactoryBean.getRegistry(RmiRegistryFactoryBean.java:200)        at org.springframework.remoting.rmi.RmiRegistryFactoryBean.getRegistry(RmiRegistryFactoryBean.java:164)        at org.springframework.remoting.rmi.RmiRegistryFactoryBean.afterPropertiesSet(RmiRegistryFactoryBean.java:135)        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1059)        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:363)        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:226)        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:147)        at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:269)        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:320)        at org.springframework.web.context.support.AbstractRefreshableWebApplicationContext.refresh(AbstractRefreshableWebApplicationContext.java:134)        at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:246)        at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:184)        at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:49)        at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3763)        at org.apache.catalina.core.StandardContext.start(StandardContext.java:4211)        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:759)        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:739)        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:524)        at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:809)        at org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:698)        at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:472)        at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1122)        at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:310)        at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1021)        at org.apache.catalina.core.StandardHost.start(StandardHost.java:718)        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1013)        at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:442)        at org.apache.catalina.core.StandardService.start(StandardService.java:450)        at org.apache.catalina.core.StandardServer.start(StandardServer.java:709)        at org.apache.catalina.startup.Catalina.start(Catalina.java:551)        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)        at java.lang.reflect.Method.invoke(Method.java:585)        at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:294)        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:432)Caused by: java.net.BindException: Address already in use        at java.net.PlainSocketImpl.socketBind(Native Method)
at java.net.PlainSocketImpl.bind(PlainSocketImpl.java:359)        at java.net.ServerSocket.bind(ServerSocket.java:319)        at java.net.ServerSocket.<init>(ServerSocket.java:185)        at java.net.ServerSocket.<init>(ServerSocket.java:97)        at sun.rmi.transport.proxy.RMIDirectSocketFactory.createServerSocket(RMIDirectSocketFactory.java:27)        at sun.rmi.transport.proxy.RMIMasterSocketFactory.createServerSocket(RMIMasterSocketFactory.java:333)        at sun.rmi.transport.tcp.TCPEndpoint.newServerSocket(TCPEndpoint.java:622)        at sun.rmi.transport.tcp.TCPTransport.listen(TCPTransport.java:231)        … 45 more11:07:27,038 ERROR [org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/alfresco]] Exception sending context initialized event to listener instance of class org.alfresco.web.app.ContextListenerorg.springframework.beans.factory.BeanCreationException: Error creating bean with name 'registry' defined in class path resource [alfresco/core-services-context.xml]: Initialization of bean failed; nested exception is java.rmi.server.ExportException: Port already in use: 50500; nested exception is:        java.net.BindException: Address already in usejava.rmi.server.ExportException: Port already in use: 50500; nested exception is:        java.net.BindException: Address already in use
….

Can somebody help me about this?
What should I do to fix the problem?
Thanks!

[rivarola]

The clue may be :

Port already in use: 50500