When saving a form in Orbeon Form Builder I get an error

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I downloaded Orbeon CE and followed this tutorial to install it http://wiki.orbeon.com/forms/doc/developer-guide/admin/installing#TOC-Software-requirements I am using Apache Tomcat.

I could open orbeon on my browser and also create and test a form without problems. The error I encounter is when I want to save it:

"Unable to complete action
There was an error communicating with the database. Please contact the application administrator."

I read here that "By default, Orbeon Forms ships with an embedded eXist database."

This is the the log of localhost I find:

2-set-2013 19.01.16 org.apache.catalina.core.StandardWrapperValve invoke GRAVE: Allocate exception for servlet exist-rest-servlet javax.servlet.ServletException: No database instance available at org.exist.http.servlets.EXistServlet.init(EXistServlet.java:140) at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1280) at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1193) at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:865) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:136) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918) at java.lang.Thread.run(Thread.java:680)

Can someone help me?

Update:

Here the exist-conf.xml:

<db-connection cacheSize="20M" collectionCache="10M" database="native" files="exist-data" pageSize="4096" nodesBuffer="-1">

I tried also to install eXist database but nothing.

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