natascha-rieter-nl/user/plugins/error/hebe.json

{
   "project":"grav-plugin-error",
   "platforms":{
      "grav":{
         "nodes":{
            "plugin":[
               {
                  "source":"/",
                  "destination":"/user/plugins/error"
               }
            ]
         }
      }
   }
}