500 error when using github site-maven-plugin to publish directory to gh-pages - maven

Question

I'm trying to use the github site plugin to copy a directory to my gh-pages branch on github. I'm getting a 500 error whenever I try, though.
Here's my build configuration:
<plugin>
<groupId>com.github.github</groupId>
<artifactId>site-maven-plugin</artifactId>
<version>0.7</version>
<configuration>
<message>Creating site for ${project.version}</message>
<branch>gh-pages</branch>
<noJekyll>true</noJekyll>
<outputDirectory>${project.build.directory}/mvn-repo</outputDirectory>
<includes>
<include>**/*</include>
</includes>
<repositoryName>greenDAO</repositoryName>
<repositoryOwner>emmby</repositoryOwner>
</configuration>
</plugin>
Here's the output of mvn ghSite:site
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building DaoCore 1.3-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- site-maven-plugin:0.7:site (default-cli) # greendao ---
[INFO] Creating 12 blobs
[INFO] Creating tree with 13 blob entries
[INFO] Creating commit with SHA-1: 656a23ffd7d898c2d45a107ee4f8f2d8ee86706e
[INFO] Creating reference gh-pages starting at commit 656a23ffd7d898c2d45a107ee4f8f2d8ee86706e
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 8.608s
[INFO] Finished at: Sat Dec 22 22:25:21 MST 2012
[INFO] Final Memory: 7M/81M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal com.github.github:site-maven-plugin:0.7:site (default-cli) on project greendao: Error creating reference: Server Error (500) -> [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
You can find the full output of mvn -X ghSite:site here.
Any ideas what I might be doing wrong?
(My authentication credentials are in my ~/.m2/settings.xml file and appear to be correct, since the push fails with an authentication error if I comment them out.)

Answer 1

Your branch is incorrect:
<branch>gh-pages</branch>
Remove it and use the default.

Answer 2

Did you try this maven plugin http://maven.apache.org/plugins/maven-scm-publish-plugin/various-tips.html ?