Fix 3f0e815f888dbbfbcd12d71f2e4ce24287415e22 failing the build: Forgot to "export" the package. If you don't do this, then it won't be viewable for other modules.

jme3-core/nbproject/project.xml

@@ -420,6 +420,7 @@
                 <package>com.jme3.gde.core.sceneexplorer.nodes</package>
                 <package>com.jme3.gde.core.sceneexplorer.nodes.actions</package>
                 <package>com.jme3.gde.core.sceneexplorer.nodes.actions.impl</package>
+                <package>com.jme3.gde.core.sceneexplorer.nodes.gizmo</package>
                 <package>com.jme3.gde.core.sceneviewer</package>
                 <package>com.jme3.gde.core.sceneviewer.actions</package>
                 <package>com.jme3.gde.core.texture</package>