why do I have this error and is it normal? Here is only Research Data and Rim-Effect

XML error: Duplicate XML node name comps in this XML block: <ThingDef ParentName="BenchBase"><defName>RE_SpacerTechResearchBench</defName><label>spacer tech research bench</label><description>A spacer tech bench with computers and electronic measurement equipment. Allows more rapid research, and unlocks advanced research projects.</description><thingClass>Building_ResearchBench</thingClass><size>(5,1)</size><minifiedDef>MinifiedThing</minifiedDef><stuffCategories><li>Metallic</li></stuffCategories><costStuffCount>150</costStuffCount><costList><Steel>100</Steel><ComponentSpacer>10</ComponentSpacer></costList><graphicData><texPath>Things/Building/Furniture/ResearchTableSpacerTech/ResearchBenchSpacerTech</texPath><graphicClass>Graphic_Multi</graphicClass><shaderType>CutoutComplex</shaderType><drawSize>(7,4)</drawSize><damageData><cornerTL>Damage/Corner</cornerTL><cornerTR>Damage/Corner</cornerTR><cornerBL>Damage/Corner</cornerBL><cornerBR>Damage/Corner</cornerBR></damageData></graphicData><castEdgeShadows>true</castEdgeShadows><staticSunShadowHeight>0.20</staticSunShadowHeight><altitudeLayer>Building</altitudeLayer><passability>PassThroughOnly</passability><pathCost>50</pathCost><statBases><MaxHitPoints>250</MaxHitPoints><WorkToBuild>8000</WorkToBuild><Flammability>1.0</Flammability><ResearchSpeedFactor>1.0</ResearchSpeedFactor></statBases><comps><li Class="CompProperties_Power"><compClass>CompPowerTrader</compClass><basePowerConsumption>500</basePowerConsumption><shortCircuitInRain>true</shortCircuitInRain></li><li Class="CompProperties_Flickable" /><li Class="CompProperties_AffectedByFacilities"><linkableFacilities><li>MultiAnalyzer</li><li>RE_AllianceTerminal</li><li>RE_AsariTerminal</li><li>ResearchSampleBench</li></linkableFacilities></li></comps><fillPercent>0.5</fillPercent><interactionCellOffset>(0,0,-1)</interactionCellOffset><hasInteractionCell>true</hasInteractionCell><terrainAffordanceNeeded>Heavy</terrainAffordanceNeeded><designationCategory>Production</designationCategory><surfaceType>Item</surfaceType><designationHotKey>Misc4</designationHotKey><constructionSkillPrerequisite>8</constructionSkillPrerequisite><placeWorkers><li>PlaceWorker_ShowFacilitiesConnections</li><li>PlaceWorker_PreventInteractionSpotOverlap</li></placeWorkers><researchPrerequisites><li>RE_MassEffectFieldManipulation</li></researchPrerequisites><techLevel>Ultra</techLevel><comps><li Class="CompProperties_Refuelable"><fuelLabel>Research Data</fuelLabel><fuelConsumptionRate>1.0</fuelConsumptionRate><fuelCapacity>1.0</fuelCapacity><fuelFilter><thingDefs><li>ResearchData</li></thingDefs></fuelFilter><consumeFuelOnlyWhenUsed>true</consumeFuelOnlyWhenUsed><showAllowAutoRefuelToggle>true</showAllowAutoRefuelToggle></li></comps></ThingDef>
UnityEngine.StackTraceUtility:ExtractStackTrace ()
(wrapper dynamic-method) Verse.Log:Verse.Log.Error_Patch2 (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 ()
(wrapper dynamic-method) Verse.XmlInheritance:Verse.XmlInheritance.Resolve_Patch2 ()
(wrapper dynamic-method) Verse.LoadedModManager:Verse.LoadedModManager.ParseAndProcessXML_Patch3 (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 ()