Hi everyone, this is my first post, please excuse my bad english.

I installed Zimbra Open Source using the Sarge packages on Etch. I can enter to the mail/calendar/contacts interface (the one that runs on port 80), but i can't access the administrative interface on the port 7071. When i point the browser to mydomain.tld:7071 it sends me to download a binary file.
Here is the (relevant part, i think) catalina.out:
INFO: Initializing Coyote HTTP/1.1 on http-80
Sep 14, 2007 1:05:39 PM org.apache.coyote.http11.Http11BaseProtocol init
INFO: Initializing Coyote HTTP/1.1 on http-7071
Sep 14, 2007 1:05:39 PM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 808 ms
Sep 14, 2007 1:05:39 PM org.apache.catalina.core.StandardService start
INFO: Starting service Catalina
Sep 14, 2007 1:05:39 PM org.apache.catalina.core.StandardEngine start
INFO: Starting Servlet Engine: Apache Tomcat/5.5.15
Sep 14, 2007 1:05:39 PM org.apache.catalina.core.StandardHost start
INFO: XML validation disabled
log4j:WARN No appenders could be found for logger (org.apache.catalina.startup.TldConfig).
log4j:WARN Please initialize the log4j system properly.
Sep 14, 2007 1:05:40 PM org.apache.catalina.core.StandardContext resourcesStart
SEVERE: Error starting static Resources
java.lang.IllegalArgumentException: Document base /opt/zimbra/apache-tomcat-5.5.15/server/webapps/host-manager does not exist or is not a readable directory
at org.apache.naming.resources.FileDirContext.setDocB ase(FileDirContext.java:140)
at org.apache.catalina.core.StandardContext.resources Start(StandardContext.java:3812)
at org.apache.catalina.core.StandardContext.start(Sta ndardContext.java:3983)
at org.apache.catalina.core.ContainerBase.addChildInt ernal(ContainerBase.java:759)
at org.apache.catalina.core.ContainerBase.addChild(Co ntainerBase.java:739)
at org.apache.catalina.core.StandardHost.addChild(Sta ndardHost.java:524)
at org.apache.catalina.startup.HostConfig.deployDescr iptor(HostConfig.java:603)
at org.apache.catalina.startup.HostConfig.deployDescr iptors(HostConfig.java:535)
at org.apache.catalina.startup.HostConfig.deployApps( HostConfig.java:470)
at org.apache.catalina.startup.HostConfig.start(HostC onfig.java:1118)
at org.apache.catalina.startup.HostConfig.lifecycleEv ent(HostConfig.java:310)
at org.apache.catalina.util.LifecycleSupport.fireLife cycleEvent(LifecycleSupport.java:119)
at org.apache.catalina.core.ContainerBase.start(Conta inerBase.java:1020)
at org.apache.catalina.core.StandardHost.start(Standa rdHost.java:718)
at org.apache.catalina.core.ContainerBase.start(Conta inerBase.java:1012)
at org.apache.catalina.core.StandardEngine.start(Stan dardEngine.java:442)
at org.apache.catalina.core.StandardService.start(Sta ndardService.java:450)
at org.apache.catalina.core.StandardServer.start(Stan dardServer.java:700)
at org.apache.catalina.startup.Catalina.start(Catalin a.java:551)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Nativ e Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Native MethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(De legatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.apache.catalina.startup.Bootstrap.start(Bootst rap.java:275)
at org.apache.catalina.startup.Bootstrap.main(Bootstr ap.java:406)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Nativ e Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Native MethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(De legatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.zimbra.cs.launcher.TomcatLauncher.start(Tomcat Launcher.java:52)
at com.zimbra.cs.launcher.TomcatLauncher.main(TomcatL auncher.java:74)
Sep 14, 2007 1:05:40 PM org.apache.catalina.core.StandardContext start
SEVERE: Error in resourceStart()
Sep 14, 2007 1:05:40 PM org.apache.catalina.core.StandardContext start
SEVERE: Error getConfigured
Sep 14, 2007 1:05:40 PM org.apache.catalina.core.StandardContext start
SEVERE: Context [/host-manager] startup failed due to previous errors
Sep 14, 2007 1:05:40 PM org.apache.catalina.core.StandardContext stop
INFO: Container org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/host-manager] has not been started
Sep 14, 2007 1:05:40 PM org.apache.catalina.startup.HostConfig deployDescriptor
WARNING: A docBase /opt/zimbra/apache-tomcat-5.5.15/webapps/zimbra inside the host appBase has been specified, and will be ignored
log4j:WARN No appenders could be found for logger (org.apache.catalina.session.ManagerBase).
log4j:WARN Please initialize the log4j system properly.
Sep 14, 2007 1:05:40 PM org.apache.catalina.core.StandardContext resourcesStart
SEVERE: Error starting static Resources
java.lang.IllegalArgumentException: Document base /opt/zimbra/apache-tomcat-5.5.15/server/webapps/manager does not exist or is not a readable directory
at org.apache.naming.resources.FileDirContext.setDocB ase(FileDirContext.java:140)
at org.apache.catalina.core.StandardContext.resources Start(StandardContext.java:3812)
at org.apache.catalina.core.StandardContext.start(Sta ndardContext.java:3983)
at org.apache.catalina.core.ContainerBase.addChildInt ernal(ContainerBase.java:759)
at org.apache.catalina.core.ContainerBase.addChild(Co ntainerBase.java:739)
at org.apache.catalina.core.StandardHost.addChild(Sta ndardHost.java:524)
at org.apache.catalina.startup.HostConfig.deployDescr iptor(HostConfig.java:603)
at org.apache.catalina.startup.HostConfig.deployDescr iptors(HostConfig.java:535)
at org.apache.catalina.startup.HostConfig.deployApps( HostConfig.java:470)
at org.apache.catalina.startup.HostConfig.start(HostC onfig.java:1118)
at org.apache.catalina.startup.HostConfig.lifecycleEv ent(HostConfig.java:310)
at org.apache.catalina.util.LifecycleSupport.fireLife cycleEvent(LifecycleSupport.java:119)
at org.apache.catalina.core.ContainerBase.start(Conta inerBase.java:1020)
at org.apache.catalina.core.StandardHost.start(Standa rdHost.java:718)
at org.apache.catalina.core.ContainerBase.start(Conta inerBase.java:1012)
at org.apache.catalina.core.StandardEngine.start(Stan dardEngine.java:442)
at org.apache.catalina.core.StandardService.start(Sta ndardService.java:450)
at org.apache.catalina.core.StandardServer.start(Stan dardServer.java:700)
at org.apache.catalina.startup.Catalina.start(Catalin a.java:551)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Nativ e Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Native MethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(De legatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.apache.catalina.startup.Bootstrap.start(Bootst rap.java:275)
at org.apache.catalina.startup.Bootstrap.main(Bootstr ap.java:406)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Nativ e Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Native MethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(De legatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.zimbra.cs.launcher.TomcatLauncher.start(Tomcat Launcher.java:52)
at com.zimbra.cs.launcher.TomcatLauncher.main(TomcatL auncher.java:74)
Sep 14, 2007 1:05:40 PM org.apache.catalina.core.StandardContext start
SEVERE: Error in resourceStart()
Sep 14, 2007 1:05:40 PM org.apache.catalina.core.StandardContext start
SEVERE: Error getConfigured
Sep 14, 2007 1:05:40 PM org.apache.catalina.core.StandardContext start
SEVERE: Context [/manager] startup failed due to previous errors
Sep 14, 2007 1:05:40 PM org.apache.catalina.core.StandardContext stop
INFO: Container org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/manager] has not been started
log4j:WARN No appenders could be found for logger (org.apache.catalina.session.ManagerBase).
log4j:WARN Please initialize the log4j system properly.
Zimbra server reserving server socket port=110 bindaddr=null ssl=false
Zimbra server reserving server socket port=995 bindaddr=null ssl=true
Zimbra server reserving server socket port=143 bindaddr=null ssl=false
Zimbra server reserving server socket port=993 bindaddr=null ssl=true
Zimbra server process is running as root, changing to user=zimbra uid=1000 gid=104
Zimbra server process, after change, is running with uid=1000 euid=1000 gid=104 egid=104
Sep 14, 2007 1:05:42 PM org.apache.coyote.http11.Http11BaseProtocol start
INFO: Starting Coyote HTTP/1.1 on http-80
Sep 14, 2007 1:05:42 PM org.apache.coyote.http11.Http11BaseProtocol start
INFO: Starting Coyote HTTP/1.1 on http-7071
Sep 14, 2007 1:05:42 PM org.apache.catalina.startup.Catalina start
Why "java.lang.IllegalArgumentException: Document base /opt/zimbra/apache-tomcat-5.5.15/server/webapps/host-manager does not exist"? I just installed, should not exists?
Let me know if you need more information.

Regards and thanks in advance.