Same error for me

Config error in PsychicLevitator: Verse.HediffCompProperties: compClass is null
UnityEngine.StackTraceUtility:ExtractStackTrace ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Log.Error_Patch1 (string)
Verse.DefDatabase`1<Verse.HediffDef>: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_0`2<System.Type, object>:<ForEachWorker>b__0 (int)
System.Threading.Tasks.Parallel/<>c__DisplayClass19_0`1<object>:<ForWorker>b__1 (System.Threading.Tasks.RangeWorker&,int,bool&)
System.Threading.Tasks.TaskReplicator/Replica`1<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 ()

This seems to happen when this mod is loaded with ve framework

It seems Intergrated Implants trying to load a VEF comp which was renamed
it's doing this

<comps>
<li Class="AnimalBehaviours.HediffCompProperties_Floating" MayRequire="oskarpotocki.vanillafactionsexpanded.core"></li>
</comps>
however it should be like that
<comps>
<li Class="VEF.AnimalBehaviours.HediffCompProperties_Floating" MayRequire="oskarpotocki.vanillafactionsexpanded.core"></li>
</comps>

Incompatible with VE too in 1.6

Could not resolve cross-reference: No Verse.HediffDef named PsychicLevitator found to give to Verse.DefHyperlink Verse.DefHyperlink
UnityEngine.StackTraceUtility:ExtractStackTrace ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Log.Error_Patch1 (string)
Verse.DirectXmlCrossRefLoader/WantedRefForObject:TryResolve (Verse.FailMode)
Verse.DirectXmlCrossRefLoader/<>c__DisplayClass16_0:<ResolveAllWantedCrossReferences>b__0 (Verse.DirectXmlCrossRefLoader/WantedRef)
Verse.GenThreading/<>c__DisplayClass7_11<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 ()

Here's another. One of my dogs ate a rotten corpse and fired this line in the log:

LabelNoCount on Corpse while Bugged.
UnityEngine.StackTraceUtility:ExtractStackTrace ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Log.Error_Patch4 (string)
Verse.Corpse:get_LabelNoCount ()
Verse.Thing:get_LabelCapNoCount ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:RimWorld.FoodUtility.AddFoodPoisoningHediff_Patch1 (Verse.Pawn,Verse.Thing,RimWorld.FoodPoisonCause)
RimWorld.CompRottable:PostIngested (Verse.Pawn)
Verse.ThingWithComps:PostIngested (Verse.Pawn)
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Thing.Ingested_Patch5 (Verse.Thing,Verse.Pawn,single)
LTS_Implants.Toils_Ingest_FinalizeIngest_Patch/<>c__DisplayClass0_0:<FinalizeIngest_Prefix>b__0 ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.AI.JobDriver.TryActuallyStartNextToil_Patch1 (Verse.AI.JobDriver)
Verse.AI.JobDriver:ReadyForNextToil ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.AI.JobDriver.DriverTick_Patch1 (Verse.AI.JobDriver)
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.AI.Pawn_JobTracker.JobTrackerTick_Patch0 (Verse.AI.Pawn_JobTracker)
Verse.Pawn:Tick ()
Verse.Thing:DoTick ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.TickList.Tick_Patch0 (Verse.TickList)
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.TickManager.DoSingleTick_Patch6 (Verse.TickManager)
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.TickManager.TickManagerUpdate_Patch0 (Verse.TickManager)
Verse.Game:UpdatePlay ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Root_Play.Update_Patch1 (Verse.Root_Play)

Getting the same error here also