chore(plugin): better error msg

ignite/cmd/plugin.go

@@ -512,7 +512,11 @@ Respects key value pairs declared after the app path to be added to the generate
 			}
 			defer plugins[0].KillClient()
 
-			if plugins[0].Error != nil {
+			if err := plugins[0].Error; err != nil {
+				if strings.Contains(err.Error(), "go.mod file not found in current directory") {
+					return errors.Errorf("We can not find an app at the root of this repository (%s), please make sure your repository url is correct. If you're trying to install an app under a sub folder don't forget to add the path at the end of your repository url. E.g. github.com/ignite/apps/appregistry.", args[0])
+				}
+
 				return errors.Errorf("error while loading app %q: %w", args[0], plugins[0].Error)
 			}
 			session.Println(icons.OK, "Done loading apps")