Edit C:\Windows\Microsoft.NET\Framework\v4.0.30319\Config\NetFx45_IIS_schema_update.xml

Edit C:\Windows\Microsoft.NET\Framework\v4.0.30319\Config\NetFx45_IIS_schema_update.xml

<configSchema>
    <sectionSchema name="system.web/customErrors">
        <attribute name="allowNestedErrors" type="bool" defaultValue="False" />
    </sectionSchema>
    <sectionSchema name="system.web/compilation">
        <attribute name="disableObsoleteWarnings" type="bool" defaultValue="True" />
        <attribute name="enablePrefetchOptimization" type="bool" defaultValue="False" />
    </sectionSchema>
    <sectionSchema name="system.web/httpRuntime">
        <attribute name="asyncPreloadMode" type="enum" defaultValue="None">
            <enum name="None" value="0" />
            <enum name="Form" value="1" />
            <enum name="FormMultiPart" value="2" />
            <enum name="NonForm" value="4" />
            <enum name="AllFormTypes" value="3" />
            <enum name="All" value="7" />
        </attribute>
        <attribute name="fcnMode" type="enum" defaultValue="NotSet">
            <enum name="NotSet" value="0" />
            <enum name="Default" value="1" />
            <enum name="Disabled" value="2" />
            <enum name="Single" value="3" />
        </attribute>
        <attribute name="targetFramework" type="string" defaultValue="" />
    </sectionSchema>
   <sectionSchema name="system.web/machineKey">
     <attribute name="applicationName" type="string" defaultValue="" />
     <attribute name="dataProtectorType" type="string" defaultValue="" />
     <attribute name="compatibilityMode" type="enum" defaultValue="Framework20SP1">
       <enum name="Framework20SP1" value="0" />
       <enum name="Framework20SP2" value="1" />
       <enum name="Framework45" value="2" />
     </attribute>
   </sectionSchema>
    <sectionSchema name="system.web/processModel">
        <attribute name="maxIoThreads" type="int" validationType="integerRange" validationParameter="1,2147483646" defaultValue="100" />
        <attribute name="maxWorkerThreads" type="int" validationType="integerRange" validationParameter="1,2147483646" defaultValue="100" />
    </sectionSchema>
</configSchema>

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