我在Linux上使用全新安装的API Manager 1.9.0。根据文档，我在carbon.xml中设置主机如下：
<!--HostName>localhost</HostName-->
<!--MgtHostName>localhost</MgtHostName-->
我的hosts文件中的Localhost设置为127.0.0.1。启动时，我收到此错误：
JAVA_HOME environment variable is set to /usr/java/jdk1.7.0_79
CARBON_HOME environment variable is set to /usr/wso2am-1.9.0
[2015-07-21 16:45:59,001] INFO - CarbonCoreActivator Starting WSO2 Carbon...
[2015-07-21 16:45:59,003] INFO - CarbonCoreActivator Operating System : Linux 2.6.32-431.29.2.el6.x86_64, amd64
[2015-07-21 16:45:59,003] INFO - CarbonCoreActivator Java Home : /usr/java/jdk1.7.0_79/jre
[2015-07-21 16:45:59,004] INFO - CarbonCoreActivator Java Version : 1.7.0_79
[2015-07-21 16:45:59,004] INFO - CarbonCoreActivator Java VM : Java HotSpot(TM) 64-Bit Server VM 24.79-b02,Oracle Corporation
[2015-07-21 16:45:59,004] INFO - CarbonCoreActivator Carbon Home : /usr/wso2am-1.9.0
[2015-07-21 16:45:59,004] INFO - CarbonCoreActivator Java Temp Dir : /usr/wso2am-1.9.0/tmp
[2015-07-21 16:45:59,004] INFO - CarbonCoreActivator User : root, en-US, US/Eastern
[2015-07-21 16:45:59,076] WARN - ValidationResultPrinter The default keystore (wso2carbon.jks) is currently being used. To maximize security when deploying to a production environment, configure a new keystore with a unique password in the production server profile.
[2015-07-21 16:45:59,077] WARN - ValidationResultPrinter Swap Memory size (MB): 0 of the system is below the recommended minimum size :2048
[2015-07-21 16:45:59,177] INFO - AgentHolder Agent created !
[2015-07-21 16:45:59,198] INFO - AgentDS Successfully deployed Agent Client
[2015-07-21 16:45:59,230] INFO - AgentHolder Agent created !
[2015-07-21 16:45:59,234] INFO - AgentDS Successfully deployed Agent Client
[2015-07-21 16:46:01,341] INFO - EmbeddedRegistryService Configured Registry in 51ms
[2015-07-21 16:46:01,500] INFO - RegistryCoreServiceComponent Registry Mode : READ-WRITE
[2015-07-21 16:46:03,008] INFO - UserStoreMgtDSComponent Carbon UserStoreMgtDSComponent activated successfully.
[2015-07-21 16:46:10,005] INFO - TaglibUriRule TLD skipped. URI: http://tiles.apache.org/tags-tiles is already defined
[2015-07-21 16:46:10,510] INFO - ClusterBuilder Clustering has been disabled
[2015-07-21 16:46:10,756] WARN - LandingPageWebappDeployer Product landing page not found.
[2015-07-21 16:46:10,757] INFO - UserStoreConfigurationDeployer User Store Configuration Deployer initiated.
[2015-07-21 16:46:10,792] INFO - PassThroughHttpSSLSender Initializing Pass-through HTTP/S Sender...
[2015-07-21 16:46:10,806] INFO - ClientConnFactoryBuilder HTTPS Loading Identity Keystore from : repository/resources/security/wso2carbon.jks
[2015-07-21 16:46:10,811] INFO - ClientConnFactoryBuilder HTTPS Loading Trust Keystore from : repository/resources/security/client-truststore.jks
[2015-07-21 16:46:10,835] INFO - PassThroughHttpSSLSender Pass-through HTTPS Sender started...
[2015-07-21 16:46:10,836] INFO - PassThroughHttpSender Initializing Pass-through HTTP/S Sender...
[2015-07-21 16:46:10,837] INFO - PassThroughHttpSender Pass-through HTTP Sender started...
[2015-07-21 16:46:11,140] INFO - DeploymentInterceptor Deploying Axis2 service: echo {super-tenant}
[2015-07-21 16:46:11,269] INFO - DeploymentEngine Deploying Web service: Echo.aar - file:/usr/wso2am-1.9.0/repository/deployment/server/axis2services/Echo.aar
[2015-07-21 16:46:11,346] INFO - DeploymentInterceptor Deploying Axis2 service: Version {super-tenant}
[2015-07-21 16:46:11,368] INFO - DeploymentEngine Deploying Web service: Version.aar - file:/usr/wso2am-1.9.0/repository/deployment/server/axis2services/Version.aar
[2015-07-21 16:46:11,507] INFO - TomcatGenericWebappsDeployer Deployed webapp: StandardEngine[Catalina].StandardHost[localhost].StandardContext[/authenticationendpoint].File[/usr/wso2am-1.9.0/repository/deployment/server/webapps/authenticationendpoint.war]
[2015-07-21 16:46:13,087] INFO - TomcatGenericWebappsDeployer Deployed webapp: StandardEngine[Catalina].StandardHost[localhost].StandardContext[/oauth2].File[/usr/wso2am-1.9.0/repository/deployment/server/webapps/oauth2.war]
[2015-07-21 16:46:14,019] INFO - DeploymentInterceptor Deploying Axis2 service: echo {super-tenant}
[2015-07-21 16:46:14,100] INFO - DeploymentInterceptor Deploying Axis2 service: Version {super-tenant}
[2015-07-21 16:46:14,117] INFO - PassThroughHttpSSLListener Initializing Pass-through HTTP/S Listener...
[2015-07-21 16:46:14,139] WARN - SourceConfiguration Unable to lookup local host name, using 'localhost'
[2015-07-21 16:46:14,142] ERROR - ListenerManager Couldn't initialize the httpstransport listener
java.lang.IllegalArgumentException: Host name may not be null
请帮忙......