Abstract type "TravelTips" must resolve to an Object type at runtime for field "Query.travelTipBySlug". Either the "TravelTips" type should provide a "resolveType" function or each possible type should provide an "isTypeOf" function.
A formidable fortress perched above the Semois River, offering an immersive journey into medieval life with corridors to wander, towers to climb for panoramic views, and falconry displays.