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Failed to find all necessary river flow data
UnityEngine.StackTraceUtility:ExtractStackTrace ()
(wrapper dynamic-method) Verse.Log:Verse.Log.Error_Patch3 (string)
Verse.Log:ErrorOnce (string,int)
RimWorld.GenStep_Terrain:GenerateRiverLookupTexture (Verse.Map,RimWorld.RiverMaker)
(wrapper dynamic-method) RimWorld.GenStep_Terrain:RimWorld.GenStep_Terrain.GenerateRiver_Patch2 (RimWorld.GenStep_Terrain,Verse.Map)
System.Reflection.MonoMethod:Invoke (object,System.Reflection.BindingFlags,System.Reflection.Binder,object[],System.Globalization.CultureInfo)
System.Reflection.MethodBase:Invoke (object,object[])
MapReroll.MapPreviewGenerator:GeneratePreviewForSeed (string,int,int,bool,MapReroll.MapPreviewGenerator/ThreadableTexture)
MapReroll.MapPreviewGenerator:DoThreadWork ()
System.Threading.ThreadHelper:ThreadStart_Context (object)
System.Threading.ExecutionContext:RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool)
System.Threading.ExecutionContext:Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool)
System.Threading.ExecutionContext:Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object)
System.Threading.ThreadHelper:ThreadStart ()