Edit C:\inetpub\wwwroot\aspnet_client\system_web\4_0_30319\crystalreportviewers13\js\previewerror.js

function writeError(header, message)
{
    document.write(
        '<link rel="stylesheet" type="text/css" href="css/exception.css">' +
        '<table class="crExceptionBorder" width="100%" cellspacing=1 cellpadding=0 border=0>' +
          '<tr><td class="crExceptionHeader">' + header + '</td></tr>' +
          '<tr><td>' +
            '<table width="100%" border=0 cellpadding=5 cellspacing=0>' +
              '<tr><td class="crExceptionElement">' + 
                '<table border=0 cellpadding=5 cellspacing=0>' +
                  '<tr><td><span class="crExceptionText">' + message + '</span></td></tr>' +
                '</table>' +
              '</td></tr>' +
            '</table>' +
          '</td></tr>' +
        '</table>\n' );
}

function _loadStrings(locale) 
{
    document.write('<script language="javascript" src="js/strings_' + locale + '.js"></script>');
}

Ms-Dos/Windows Unix Write backup

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