If I understand what you're saying then my code should look like this.
<?php
// WebAssist iRite: Rich Text Editor for Dreamweaver
$WARichTextEditor_1 = CreateRichTextEditor ("ContentValue", "../HTMLEditor/", "713px", "400px", "Custom", "../custom/contents_update_ContentValue1.php", "".($totalRows_HistoryUpdate > 0)?((isset($_POST['ContentValue']) && $row_HistoryUpdate['HistoryValue'] != $_POST['ContentValue'])?$row_WADAContents['ContentValue']:$row_HistoryUpdate['HistoryValue']):$row_WADAContents['ContentValue'] ."");
?>
I don't get the same error but now I get an alert window that says:
Toolbar set "Custom" doesn't exist.