Radically easy to access on brand approved content for distribution and omnichannel performant delivery. AEM Assets Content Hub and Dynamic Media with OpenAPI capabilities is now GA.
1) You don't say what version of Communities you have. If you have not installed any Communities feature packs on AEM 6.1, then that could be the source of your problem. Please install the latest feature pack.
2) Geometrixx is deprecated as sample code for AEM Communities.