Invalid prop: type check failed for prop "layer". Expected BaseLayer, got Object

vue.runtime.esm.js:619 [Vue warn]: Invalid prop: type check failed for prop "layer". Expected BaseLayer, got Object 

found in

---> <DemapLegendLayerEntry> at de-frontend-framework/lib/map/legend/DemapLegendLayerEntry.vue
       <VListItem>
         <VListGroup>
           <DemapLegendLayerGroup> at de-frontend-framework/lib/map/legend/DemapLegendLayerGroup.vue
             <VListItem>
               <VList>
                 <DemapLegend> at de-frontend-framework/lib/map/legend/DemapLegend.vue
                   <Demap> at de-frontend-framework/lib/map/Demap.vue
                     <GaugeMap> at components/flood/similarity/GaugeMap.vue
                       <SimilarityWorkflow> at pages/flood/similarity.vue
                         <Pages/flood.vue> at pages/flood.vue
                           <Nuxt>
                             <VApp>
                               <Default> at layouts/default.vue
                                 <Root>