Need Help to The Old Spike

[BadCops]

Plz can you tell me why my code don't work server error on loading

<configs>


<append xpath="/blocks/block[@name=rScrapIronLogSpike5]">

 


<property class="UpgradeBlock">


<property name="ToBlock" value="ConcreteLogSpike7"/>


<property name="Item" value="resourceConcreteMix"/>


<property name="ItemCount" value="10"/>


<property name="UpgradeHitCount" value="4"/>


</property>


<property name="DowngradeBlock" value="rScrapIronLogSpike"/>

 


</append>

 


<append xpath="/blocks/block[@name=steelLogSpike6]">


<property class="UpgradeBlock">


<property name="ToBlock" value="FireSteelLogSpike"/>


<property name="Item" value="ammoGasCan"/>


<property name="ItemCount" value="25"/>


<property name="UpgradeHitCount" value="4"/>


</property>


<property name="DowngradeBlock" value="ConcreteLogSpike7"/>


</append>

 

 

 

 


<append xpath="/blocks">


<block name="ConcreteLogSpike7">


<property name="CreativeMode" value="Dev"/>


<property name="Damage" value="7"/>


<property name="Damage_received" value="10"/>


<property name="Texture" value="315"/>


<property name="ImposterExchange" value="imposterPyramid" param1="110"/>


<property class="RepairItems"> <property name="resourceConcreteMix" value="10"/> </property>


<property class="UpgradeBlock">


<property name="ToBlock" value="steelLogSpike6"/>


<property name="Item" value="resourceForgedSteel"/>


<property name="ItemCount" value="10"/>


<property name="UpgradeHitCount" value="4"/>


</property>


<property name="DowngradeBlock" value="rScrapIronLogSpike5"/>


</block>

 


<block name="FireSteelLogSpike">


<property name="Extends" value="steelLogSpike6"/>


<property name="CreativeMode" value="Dev"/>


<property name="Damage" value="7"/>


<property name="Damage_received" value="10"/>


<property name="Texture" value="346,345,341,345,262,345"/>


<property name="ImposterExchange" value="imposterPyramid" param1="110"/>


<property name="DowngradeBlock" value="steelLogSpike6"/>


<property class="RepairItems"> <property name="ammoGasCan" value="25"/> </property>


</block>

 


</append>


</configs>

i add Condrete Spike And Fire Steel Spike