Wrong folder structure.
/Modules/_modulename_/DSCResources/_resourcename_
_modulename_ has to be a real module with at least a .PSD1. E.g., xNetworking.
_resourcename_ is the actual resource, and must contain a .PSM1, the schema MOF, and usually a .PSD1. E.g., xIPAddress.
You can't just have a \DSCResources under \Modules.