An error constantly appearing

[Nova_J_20]

So I decided to give rimworld a try again and everytime I load up the game, this error occurs.

RimWorld 1.1.2647 rev731
Verse.Log:Message(String, Boolean)
RimWorld.VersionControl:LogVersionNumber()
Verse.Root:CheckGlobalInit()
Verse.Root:Start()
Verse.Root_Entry:Start()

Could not resolve cross-reference: No Verse.HediffDef named BloodRot found to give to Verse.RecipeDef CureBloodRot
Verse.Log:Error(String, Boolean)
Verse.WantedRefForObject:TryResolve(FailMode)
Verse.<>c__DisplayClass15_1:<ResolveAllWantedCrossReferences>b__0(WantedRef)
Verse.<>c__DisplayClass6_1`1:<ParallelForEach>b__0(Object)
System.Threading.QueueUserWorkItemCallback:WaitCallback_Context(Object)
System.Threading.ExecutionContext:RunInternal(ExecutionContext, ContextCallback, Object, Boolean)
System.Threading.ExecutionContext:Run(ExecutionContext, ContextCallback, Object, Boolean)
System.Threading.QueueUserWorkItemCallback:System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
System.Threading.ThreadPoolWorkQueue:Dispatch()
System.Threading._ThreadPoolWaitCallback:PerformWaitCallback()

Could not resolve cross-reference: No Verse.HediffDef named Abasia found to give to Verse.RecipeDef CureAbasia
Verse.Log:Error(String, Boolean)
Verse.WantedRefForObject:TryResolve(FailMode)
Verse.<>c__DisplayClass15_1:<ResolveAllWantedCrossReferences>b__0(WantedRef)
Verse.<>c__DisplayClass6_1`1:<ParallelForEach>b__0(Object)
System.Threading.QueueUserWorkItemCallback:WaitCallback_Context(Object)
System.Threading.ExecutionContext:RunInternal(ExecutionContext, ContextCallback, Object, Boolean)
System.Threading.ExecutionContext:Run(ExecutionContext, ContextCallback, Object, Boolean)
System.Threading.QueueUserWorkItemCallback:System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
System.Threading.ThreadPoolWorkQueue:Dispatch()
System.Threading._ThreadPoolWaitCallback:PerformWaitCallback()


What can I do to fix this issue?