I own Rimworld on GOG and cannot leave comments on Steam. For some reason I can start discussions though. In the comments section a user named Cyano points out an issue present when VEF is installed. I have the same or a similar issue. I get the red error pasted below when I launch the game, and during game-play am completely blocked from placing the wall heater. Any guidance is appreciated. Thank you! ^_^

Config error in Vent_Over: is airtight but Fillage is not Full UnityEngine.StackTraceUtility:ExtractStackTrace () (wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Log.Error_Patch2 (string) Verse.DefDatabase1<Verse.BuildableDef>:ErrorCheckAllDefs () System.Reflection.RuntimeMethodInfo:Invoke (object,System.Reflection.BindingFlags,System.Reflection.Binder,object[],System.Globalization.CultureInfo) System.Reflection.MethodBase:Invoke (object,object[]) Verse.GenGeneric:InvokeStaticMethodOnGenericType (System.Type,System.Type,string) Verse.PlayDataLoader/<>c:<DoPlayLoad>b__4_1 (System.Type) System.Threading.Tasks.Parallel/<>c__DisplayClass33_02<System.Type, object>:<ForEachWorker>b__0 (int) System.Threading.Tasks.Parallel/<>c__DisplayClass19_01<object>:<ForWorker>b__1 (System.Threading.Tasks.RangeWorker&,int,bool&) System.Threading.Tasks.TaskReplicator/Replica1<System.Threading.Tasks.RangeWorker>:ExecuteAction (bool&) System.Threading.Tasks.TaskReplicator/Replica:Execute () System.Threading.Tasks.TaskReplicator/Replica/<>c:<.ctor>b__4_0 (object) System.Threading.Tasks.Task:InnerInvoke () System.Threading.Tasks.Task:Execute () System.Threading.Tasks.Task:ExecutionContextCallback (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.Tasks.Task:ExecuteWithThreadLocal (System.Threading.Tasks.Task&) System.Threading.Tasks.Task:ExecuteEntry (bool) System.Threading.Tasks.Task:System.Threading.IThreadPoolWorkItem.ExecuteWorkItem () System.Threading.ThreadPoolWorkQueue:Dispatch () System.Threading._ThreadPoolWaitCallback:PerformWaitCallback ()