An unexpected error has occurred!
Error Message:The Data Extension name for a LookupRows function call is invalid. A Data Extension of this name does not exist. Data Extension Name: Apr2012_HMHB_Zip_Code_Markets Function Call: LookupRows("Apr2012_HMHB_Zip_Code_Markets","Zip",@AttValue) Parameter Name: DataExtensionName Parameter Ordinal: 1
Description:An unexpected error occurred during the execution of the page.
line 0, column 0
Exception Info:
An error occurred when attempting to parse HtmlEmailBody content for HTML content.
  MemberID: 91370
  JobID: 21643393
  ListID: 1158221
  Content Begins With: <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"

ExactTarget.OMM.InvalidScriptException:  The SET variable value expression is invalid.  See inner exception for detail.
  Script: SET @Rows = LookupRows("Apr2012_HMHB_Zip_Code_Markets","Zip",@AttValue)
  Variable Name: @Rows
  Index: 176
  ListID: 1158221
Source:  OMMCommon