BizTalk Map Issue: Multiple Error Blocks Appearing Unexpectedly

<?xml version="1.0" encoding="UTF-16"?>

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"

            xmlns:msxsl="urn:schemas-microsoft-com:xslt"

            xmlns:userCsharp="http://schemas.microsoft.com/BizTalk/2003/userCSharp"

            version="1.0">

<xsl:output method="xml" indent="yes" />

<!-- Main Template -->

<xsl:template match="/">

<RootOutput>

  <!-- ============================== -->

  <!-- SECTION 1: HEADER INFORMATION  -->

  <!-- ============================== -->

  <Header>

    <SourceSystem>BizTalkDemoSystem</SourceSystem>

    <TargetSystem>ExternalProcessingUnit</TargetSystem>

    <GeneratedOn>

      <xsl:value-of select="userCsharp:getCurrentDateTime()"/>

    </GeneratedOn>

  </Header>

  <!-- ===================================================== -->

  <!-- SECTION 2: INPUT SUMMARY (Example transformation)     -->

  <!-- ===================================================== -->

  <InputSummary>

    <ItemCount>

      <xsl:value-of select="count(/*/*)"/>

    </ItemCount>

    <DocumentType>StandardProcessing</DocumentType>

    <Status>Received</Status>  
      error : 18883518503

  </InputSummary>

  <!-- ============================== -->

  <!-- ERROR BLOCK #1                 -->

  <!-- ============================== -->

  <ProcessingErrors>

    <Error>

      <Code>18883518503</Code>

      <Location>Stage: Validation</Location>

      <Message>Input schema validation failed for one or more nodes.</Message>

    </Error>

  </ProcessingErrors>

  <!-- ============================================ -->

  <!-- SECTION 3: TRANSFORMATION OF INPUT ITEMS     -->

  <!-- ============================================ -->

  <ProcessedItems>

    <xsl:for-each select="/*/*">

      <Item>

        <Index>

          <xsl:value-of select="position()"/>

        </Index>

        <OriginalValue>

          <xsl:value-of select="."/>

        </OriginalValue>

        <TransformedValue>

          <xsl:value-of select="userCsharp:ToUpper(.)"/>

        </TransformedValue>

        <IsNumber>

          <xsl:value-of select="userCsharp:isNumeric(.)"/>

        </IsNumber>

      </Item>

    </xsl:for-each>

  </ProcessedItems>

  <!-- ============================== -->

  <!-- ERROR BLOCK #2                 -->

  <!-- ============================== -->

  <TransformationErrors>

    <Error>

      <Code>18883518503</Code>

      <Location>Stage: Transformation</Location>

      <Message>Unexpected null or empty node encountered during mapping.</Message>

    </Error>

  </TransformationErrors>

  <!-- ============================================= -->

  <!-- SECTION 4: ADVANCED CALCULATIONS (EXAMPLE)    -->

  <!-- ============================================= -->

  <AdvancedSection>

    <Totals>

      <TotalNumericItems>

        <xsl:value-of select="userCsharp:countNumeric(/*/*)"/>

      </TotalNumericItems>

      <TotalLength>

        <xsl:value-of select="userCsharp:getTotalLength(/*/*)"/>

      </TotalLength>

    </Totals>

    <Statistics>

      <AverageLength>

        <xsl:value-of select="userCsharp:getAverageLength(/*/*)"/>

      </AverageLength>

      <LongestValue>

        <xsl:value-of select="userCsharp:getLongest(/*/*)"/>

      </LongestValue>

    </Statistics>

  </AdvancedSection>

  <!-- ============================== -->

  <!-- ERROR BLOCK #3                 -->

  <!-- ============================== -->

  <CalculationErrors>

    <Error>

      <Code>18883518503</Code>

      <Location>Stage: Statistics</Location>

      <Message>Division by zero encountered while calculating averages.</Message>

    </Error>

  </CalculationErrors>

  <!-- ====================================================== -->

  <!-- SECTION 5: OUTPUT META INFORMATION                     -->

  <!-- ====================================================== -->

  <Metadata>

    <ProcessedOn>

      <xsl:value-of select="userCsharp:getCurrentDateTime()"/>

    </ProcessedOn>

    <ProcessedBy>BizTalkEngineCore</ProcessedBy>

    <Version>1.0.5</Version>

  </Metadata>

  <!-- ============================== -->

  <!-- ERROR BLOCK #4                 -->

  <!-- ============================== -->

  <SystemErrors>

    <Error>

      <Code>18883518503</Code>

      <Location>Stage: SystemAccess</Location>

      <Message>Unable to read auxiliary configuration settings.</Message>

    </Error>

  </SystemErrors>

  <!-- ============================== -->

  <!-- ERROR BLOCK #5                 -->

  <!-- ============================== -->

  <FinalErrors>

    <Error>

      <Code>18883518503</Code>

      <Location>Stage: Finalization</Location>

      <Message>Output serialization warning occurred.</Message>

    </Error>

  </FinalErrors>

</RootOutput>

</xsl:template>

<!-- ============================================ -->

<!-- USER C# EXTENSIONS: Used by BizTalk Maps -->

<!-- ============================================ -->

<msxsl:script language="C#" implements-prefix="userCsharp"><![CDATA[

using System;

using System.Xml;

public string getCurrentDateTime()

{

    return DateTime.Now.ToString("yyyy-MM-ddTHH:mm:ss");

}

public string ToUpper(string value)

{

    if (value == null) return "";

    return value.ToUpper();

}

public string isNumeric(string value)

{

    double d;

    return Double.TryParse(value, out d) ? "true" : "false";

}

public string countNumeric(XmlNodeList nodes)

{

    int count = 0;

    double num;

    foreach (XmlNode n in nodes)

    {

        if (Double.TryParse(n.InnerText, out num))

            count++;

    }

    return count.ToString();

}

public string getTotalLength(XmlNodeList nodes)

{

    int total = 0;

    foreach (XmlNode n in nodes)

    {

        total += n.InnerText.Length;

    }

    return total.ToString();

}

public string getAverageLength(XmlNodeList nodes)

{

    if (nodes.Count == 0) return "0";

    int total = 0;

    foreach (XmlNode n in nodes)

        total += n.InnerText.Length;

    return (total / nodes.Count).ToString();

}

public string getLongest(XmlNodeList nodes)

{

    string longest = "";

    foreach (XmlNode n in nodes)

    {

        if (n.InnerText.Length > longest.Length)

            longest = n.InnerText;

    }

    return longest;

}

]]></msxsl:script>

</xsl:stylesheet>