Hi,Please check
The prefix "granite" for attribute "granite:class" associated with an element type "dynamicmediaGroup" is not bound.
Example of correct XML namespaceshttps://github.com/adobe/aem-core-wcm-components/blob/8fbb5674a7170c7caaac1604ac9849eff1ea83a7/content/src/content/jcr_root/apps/cor...