大家好：
今天我使用https://cwiki.apache.org/confluence/display/CLOUDSTACK/Setting+up+CloudStack+Development+Environment+on+Linux为指导手册在ubuntu上编译cloudstack，但是一直报错，报错的日志是以下内容：
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal
org.apache.maven.plugins:maven-remote-resources-plugin:1.3:process (default) on
project cloud-client-ui: Error resolving project artifact: Could not transfer
artifact org.libvirt:libvirt:pom:0.4.9 from/to central
(http://repo.maven.apache.org/maven2): Failed to transfer file:
http://repo.maven.apache.org/maven2/org/libvirt/libvirt/0.4.9/libvirt-0.4.9.pom.
Return code is: 503 for project org.libvirt:libvirt:jar:0.4.9 -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e
switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please
read the following articles:
[ERROR] [Help 1]
http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
[ERROR]
[ERROR] After correcting the problems, you can resume the build with the command
[ERROR] mvn <goals> -rf :cloud-client-ui
其中已确认/root/.m2/repository/org/libvirt/libvirt/0.4.9/libvirt-0.4.9.pom已经下载完成。
请大家帮忙看看这个是什么原因？
