边缘世界 RimWorld

边缘世界 RimWorld

Combat Extended [1.4]
HeavyTurrets
What is this error and how to fix it? I didn't mod the turrets.
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Could not resolve cross-reference to Verse.ResearchProjectDef named HeavyTurrets (wanter=prerequisites)
UnityEngine.StackTraceUtility:ExtractStackTrace ()
Verse.Log:Error (string)
Verse.DirectXmlCrossRefLoader:TryResolveDef<Verse.ResearchProjectDef> (string,Verse.FailMode,object)
Verse.DirectXmlCrossRefLoader/WantedRefForList`1<Verse.ResearchProjectDef>:TryResolve (Verse.FailMode)
Verse.DirectXmlCrossRefLoader/<>c__DisplayClass15_1:<ResolveAllWantedCrossReferences>b__0 (Verse.DirectXmlCrossRefLoader/WantedRef)
Verse.GenThreading/<>c__DisplayClass7_1`1<Verse.DirectXmlCrossRefLoader/WantedRef>:<ParallelForEach>b__0 (object)
System.Threading.QueueUserWorkItemCallback:WaitCallback_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.QueueUserWorkItemCallback:System.Threading.IThreadPoolWorkItem.ExecuteWorkItem ()
System.Threading.ThreadPoolWorkQueue:Dispatch ()
System.Threading._ThreadPoolWaitCallback:PerformWaitCallback ()