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