This log seems to be related to the militor.
Happens Right after the loading of the game.

XML error: Duplicate XML node name combatPower in this XML block: <PawnKindDef ParentName="LightMechanoidKind"><defName>Mech_Militor</defName><label>militor</label><race>Mech_Militor</race><combatPower>45</combatPower><lifeStages><li><bodyGraphicData><texPath>Things/Pawn/Mechanoid/Militor</texPath><maskPath>Things/Pawn/Mechanoid/AllegianceOverlays/Mech_Slugger</maskPath><shaderType>CutoutWithOverlay</shaderType><graphicClass>Graphic_Multi</graphicClass><drawSize>1.25</drawSize><shadowData><volume>(0.3, 0.4, 0.3)</volume><offset>(0,0,-0.25)</offset></shadowData></bodyGraphicData></li><li><bodyGraphicData><texPath>Things/Pawn/Mechanoid/MilitorAncient</texPath><maskPath>Things/Pawn/Mechanoid/AllegianceOverlays/Mech_Slugger</maskPath><shaderType>CutoutWithOverlay</shaderType><graphicClass>Graphic_Multi</graphicClass><drawSize>1.25</drawSize><shadowData><volume>(0.3, 0.4, 0.3)</volume><offset>(0,0,-0.25)</offset></shadowData></bodyGraphicData></li></lifeStages><weaponTags><li>MechanoidGunShortRange</li></weaponTags><combatPower>90</combatPower><modExtensions><li Class="CombatExtended.LoadoutPropertiesExtension"><primaryMagazineCount><min>5</min><max>6</max></primaryMagazineCount></li></modExtensions></PawnKindDef>
UnityEngine.StackTraceUtility:ExtractStackTrace ()
Verse.Log:Error (string)
Verse.XmlInheritance:CheckForDuplicateNodes (System.Xml.XmlNode,System.Xml.XmlNode)
Verse.XmlInheritance:ResolveXmlNodeFor (Verse.XmlInheritance/XmlInheritanceNode)
Verse.XmlInheritance:ResolveXmlNodesRecursively (Verse.XmlInheritance/XmlInheritanceNode)
Verse.XmlInheritance:ResolveXmlNodesRecursively (Verse.XmlInheritance/XmlInheritanceNode)
Verse.XmlInheritance:ResolveXmlNodesRecursively (Verse.XmlInheritance/XmlInheritanceNode)
Verse.XmlInheritance:ResolveXmlNodes ()
Verse.XmlInheritance:Resolve ()
Verse.LoadedModManager:ParseAndProcessXML (System.Xml.XmlDocument,System.Collections.Generic.Dictionary`2<System.Xml.XmlNode, Verse.LoadableXmlAsset>)
Verse.LoadedModManager:LoadAllActiveMods ()
Verse.PlayDataLoader:DoPlayLoad ()
Verse.PlayDataLoader:LoadAllPlayData (bool)
Verse.Root/<>c:<Start>b__6_1 ()
Verse.LongEventHandler:RunEventFromAnotherThread (System.Action)
Verse.LongEventHandler/<>c:<UpdateCurrentAsynchronousEvent>b__27_0 ()
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 ()