I guess its building on tips for other people?

I'm not sure what this error means, but it seems like its an incompatibility with a class in the Hudson src.

Hudson-GIT-plugin/src/main/java/hudson/plugins/git/util/BuildChooser.java:78: incompatible types; no instance(s) of type variable(s) D exist so that hudson.DescriptorExtensionList<hudson.plugins.git.util.BuildChooser,D> conforms to hudson.DescriptorExtensionList<hudson.plugins.git.util.BuildChooser,hudson.plugins.git.util.BuildChooserDescriptor>
found : <D>hudson.DescriptorExtensionList<hudson.plugins.git.util.BuildChooser,D>
required: hudson.DescriptorExtensionList<hudson.plugins.git.util.BuildChooser,hudson.plugins.git.util.BuildChooserDescriptor>
return Hudson.getInstance().getDescriptorList(BuildChooser.class);