Hi 
I used mvn clean install -P developer,systemvm according to 
https://cwiki.apache.org/CLOUDSTACK/how-to-build-on-master-branch.html
but i got this error  
.
.
.
Exception in thread "main" java.lang.UnsupportedClassVersionError: 
XmlToHtmlConverter : Unsupported major.minor version 51.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:634)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:277)
at java.net.URLClassLoader.access$000(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:212)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
Could not find the main class: XmlToHtmlConverter. Program will exit.
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO] 
[INFO] Apache CloudStack ................................. SUCCESS [6.625s]
[INFO] Apache CloudStack Utils ........................... SUCCESS [27.954s]
[INFO] Apache CloudStack API ............................. SUCCESS [25.212s]
[INFO] Apache CloudStack Framework ....................... SUCCESS [0.163s]
....
....
...
INFO] Apache CloudStack Developer Tools ................. SUCCESS [0.159s]
[INFO] Apache CloudStack apidocs ......................... FAILURE [16.577s]
[INFO] Apache CloudStack marvin .......................... SKIPPED
[INFO] Apache CloudStack cloudmonkey cli ................. SKIPPED
[INFO] Apache CloudStack DevCloud ........................ SKIPPED
[INFO] Apache CloudStack DevCloud-KVM .................... SKIPPED
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 10:53.864s
[INFO] Finished at: Fri May 10 20:21:00 IRDT 2013
[INFO] Final Memory: 47M/329M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.2.1:exec 
(compile) on project cloud-apidoc: Command execution failed. Process exited 
with an error: 1 (Exit value: 1) -> [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-apidoc

I tested it without developer    mvn clean install -P systemvm 

but, again i got the same error.
please tell me how I can fix this error.

Sincerely
Mehdi Ali Soltani

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