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This Error happened after fixing Tag Cloud Bug. No Reply form DSC so I had to delete all HTML and Article Entries.
Sequence contains more than one matching element
<div style="border-collapse: collapse; font-family: Arial, Helvetica, sans-serif; font-size: 13px; line-height: 19px; ">Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
<div style="border-collapse: collapse; font-family: Arial, Helvetica, sans-serif; font-size: 13px; line-height: 19px; ">Exception Details: System.InvalidOperationException: Sequence contains more than one matching element
<div style="border-collapse: collapse; font-family: Arial, Helvetica, sans-serif; font-size: 13px; line-height: 19px; ">Source Error:
<div style="border-collapse: collapse; font-family: Arial, Helvetica, sans-serif; font-size: 13px; line-height: 19px; ">
Line 145: else
Line 146: preArticle.Groups = groups;
Line 147: preArticle = articles.Single(a => a.ArticleId == ga.ArticleId);
Line 148: groups = new List<Group>();
Line 149: }
Source File: d:\AcrEStore_4.0\Web\View\ArticleListControl.ascx.cs Line: 147
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