[selenium-users] The error message is: Access to 'file:///space/[...]' from script denied

My environment:

    - OS
       - Ubuntu 12.04 LTS
    - Maven
       - Apache Maven 3.0.4
       - Maven home: /usr/share/maven
       - MAVEN_OPTS=-Xmx768m -Xms64m -XX:MaxPermSize=256M
       -agentlib:jdwp=transport=dt_socket,address=8000,server=y,suspend=n
    - Java
       - Version: 1.6.0_43, vendor: Sun Microsystems Inc.
       - Java home: /space/Development/jdk6/jdk1.6.0_43/jre
       - Default locale: en_GB, platform encoding: UTF-8
       - OS name: "linux", version: "3.2.0-56-generic", arch: "amd64",
       family: "unix"
    - Xvfb
       - /usr/bin/Xvfb


When I run mvn install my Integration Tests fail with the following
stacktrace. I don't know what else to do in order to get rid of this
problem. Can you give me directions on how to solve it?

The error message is: Access to

The references to selenium from my pom.xml is
[...]
<dependency>
     <groupId>org.seleniumhq.selenium.client-drivers</groupId>
     <artifactId>selenium-java-client-driver</artifactId>
     <version>1.0.2</version>
     <scope>test</scope>
</dependency>
</dependencies>
<build>
     <plugins>
         <plugin>
             <groupId>org.mortbay.jetty</groupId>
     <artifactId>maven-jetty-plugin</artifactId>
     <configuration>
         <stopPort>9944</stopPort>
<stopKey>foo</stopKey>
<contextPath>/gcm</contextPath>
<connectors>
     <connector
implementation="org.mortbay.jetty.nio.SelectChannelConnector">
         <port>8181</port>
<maxIdleTime>60000</maxIdleTime>
     </connector>
</connectors>
     </configuration>
     <executions>
         <execution>
     <id>start-jetty</id>
     <phase>pre-integration-test</phase>
     <goals>
         <goal>run-war</goal>
     </goals>
     <configuration>
         <daemon>true</daemon>
     </configuration>
</execution>
     </executions>
</plugin>
<plugin>
     <groupId>org.codehaus.mojo</groupId>
     <artifactId>selenium-maven-plugin</artifactId>
     <version>2.3</version>
     <executions>
         <execution>
     <id>xvfb</id>
     <phase>pre-integration-test</phase>
     <goals>
         <goal>xvfb</goal>
     </goals>
     <configuration>
         <options>
     <option>-ac</option>
</options>
     </configuration>
</execution>
<execution>
     <id>start</id>
     <phase>pre-integration-test</phase>
     <goals>
         <goal>start-server</goal>
     </goals>
     <configuration>
         <background>true</background>
<logOutput>true</logOutput>
<multiWindow>true</multiWindow>
<port>4444</port>
<ensureCleanSession>true</ensureCleanSession>
     </configuration>
</execution>
<execution>
     <id>stop</id>
     <phase>post-integration-test</phase>
     <goals>
         <goal>stop-server</goal>
     </goals>
</execution>
     </executions>
</plugin>
[...]

Thank you for any ideas.