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Merging data into macro form: e:\wbchp\amazon.html

WebBase macro error in: {if Description notNull} **Variable error in: {if Description notNull} **Variable 'Description' does not exist. Remember, variable names, database field names and operators are CASE SENSITIVE. (EwGf01.53@Windows NT 5.0)**
in insert file: e:\wbchp\metatags.htf
{if Description notNull} <META NAME="keywords" CONTENT="{Keywords}"> <META NAME="description" CONTENT="{Description}"> {else} <META NAME="description" CONTENT="COOL house plans offers a unique variety of professionally designed home plans with floor plans by accredited home designers. Styles include country house plans, colonial, Victorian, European, and ranch. Blueprints for small to luxury home styles."> <META NAME="keywords" CONTENT="house plans, home plans, floorplans, blueprints, houseplans, luxury home, garage, Victorian, ranch, small, colonial, craftsman, country"> {/if} {print} <script type="text/javascript" src="https://secure.vmc3.com/chpsecure/includes/chp_scripts.js"></script> ...
**
'Description' 'notNull' Stack: []
** ERROR: "Variable 'Description' does not exist. Remember, variable names, database field names and operators are CASE SENSITIVE. (EwGf01.53@Windows NT 5.0)" **
**

in insert file: e:\wbchp\metatags.htf

{if Description notNull}

<META NAME="keywords" CONTENT="{Keywords}">
<META NAME="description" CONTENT="{Description}">

{else}

<META NAME="description" CONTENT="COOL house plans offers a unique variety of professionally designed home plans with floor plans by accredited home designers. Styles include country house plans, colonial, Victorian, European, and ranch. Blueprints for small to luxury home styles.">
<META NAME="keywords" CONTENT="house plans, home plans, floorplans, blueprints, houseplans, luxury home, garage, Victorian, ranch, small, colonial, craftsman, country">

{/if}

{print}
<script type="text/javascript" src="https://secure.vmc3.com/chpsecure/includes/chp_scripts.js"></script>
...

'Description'
'notNull'
Stack: []

** ERROR: "Variable 'Description' does not exist. Remember, variable names, database field names and operators are CASE SENSITIVE. (EwGf01.53@Windows NT 5.0)" **