Problems with com.github.github:site-maven-plugin:0.9:site

I configured things according to https://github.com/github/maven-plugins

But when I try to run 'mvn site' I get the following errors.

Does the gh-pages branch need to be created manually first, or should
the plug-in do that automatically? Or am I chasing some other type of error.

Cheers, Eric

[ERROR] Failed to execute goal
com.github.github:site-maven-plugin:0.9:site (default) on project
java-file-utilities: Error creating blob: Not Found (404) -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to
execute goal com.github.github:site-maven-plugin:0.9:site (default) on
project java-file-utilities: Error creating blob: Not Found (404)
at
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:216)
at
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
at
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
at
org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
at
org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
at
org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
at
org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:317)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:152)
at org.apache.maven.cli.MavenCli.execute(MavenCli.java:555)
at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:214)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:158)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at
org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
at
org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
at
org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
at
org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
Caused by: org.apache.maven.plugin.MojoExecutionException: Error
creating blob: Not Found (404)
at
com.github.maven.plugins.site.SiteMojo.createBlob(SiteMojo.java:289)
at
com.github.maven.plugins.site.SiteMojo.execute(SiteMojo.java:352)
at
org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:106)
at
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208)
... 19 more
Caused by: org.eclipse.egit.github.core.client.RequestException: Not
Found (404)
at
org.eclipse.egit.github.core.client.GitHubClient.createException(GitHubClient.java:552)
at
org.eclipse.egit.github.core.client.GitHubClient.sendJson(GitHubClient.java:643)
at
org.eclipse.egit.github.core.client.GitHubClient.post(GitHubClient.java:757)
at
org.eclipse.egit.github.core.service.DataService.createBlob(DataService.java:115)
at
com.github.maven.plugins.site.SiteMojo.createBlob(SiteMojo.java:285)
... 22 more
[ERROR]
[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
D:\Users\Eric\Software\Project\Repositories\java-file-utilities>