maven仓库 nexus启动报错?报错

2013-06-27 11:22:06 INFO  [main           ] - org.sonatype.security.configuration.source.FileSecurityConfigurationSource - Loading Security configuration from C:\Documents and Settings\Administrator\sonatype-work\nexus\conf\security-configuration.xml
2013-06-27 11:22:06 WARN  [main           ] - org.sonatype.security.configuration.source.FileSecurityConfigurationSource - Security configuration file was not loaded, it has the wrong structure.
2013-06-27 11:22:06 WARN  [main           ] - Sisu - Error injecting: org.sonatype.nexus.configuration.application.DefaultNexusConfiguration
com.google.inject.ProvisionException: Guice provision errors:
1) Error injecting constructor, java.lang.NullPointerException
  at org.sonatype.security.DefaultSecuritySystem.<init>(Unknown Source)
  at file:/D:/war%20Tomcat/apache-tomcat-6.0.33/webapps/nexus2.6/WEB-INF/lib/security-system-2.4.1.jar!/
  while locating org.sonatype.security.DefaultSecuritySystem
  while locating org.sonatype.security.SecuritySystem
  while locating org.sonatype.nexus.configuration.application.DefaultNexusConfiguration