Getting error while deploying Paging folder in tomcat 4.1

An error occurred while evaluating custom action attribute "count" with value "${tCount}": An exception occured trying to convert String "tcount" to type "java.lang.Long" (null)

Kindly help in this regards
Not able to deploy Paging datagrid folder in tomcat folder

My JSP Paging Code is

<%@ page contentType="text/html"%>
    <%@ page import="java.util.*"%>
	<%@ page import="org.apache.taglibs.datagrid.DataGridParameters"%> 
	<%@	page import="java.sql.*"%>
    <%@	page import="emp.*"%>
    <%@ taglib uri="http://jakarta.apache.org/taglibs/datagrid-1.0" prefix="ui" %>
    <%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
    <%@ taglib uri="http://java.sun.com/jstl/fmt" prefix="fmt" %>

<html>
  <head>
     <title>jsp paging example in datagrid</title>
	  <style>
    th a:link      { text-decoration: none; color: black }
     th a:visited   { text-decoration: none; color: black }
     .rows          { background-color: white }
     .hiliterows    { background-color: pink; color: #000000; font-weight: bold }
     .alternaterows { background-color: #efefef }
     .header        { background-color: cyan; color: #000000;font-weight: bold }
	
     .datagrid      { border: 1px solid #C7C5B2; font-family: arial; font-size: 9pt;
	    font-weight: normal }
   </style>
  </head>
  <body>
  <br><br>
  
	<span align="center" style="padding-left:250px;font-size:20px;">Employee Records</span>
	<br>
		<%  ArrayList empList = new ArrayList ();
		   Employee  empObj;
		   int fromIndex, toIndex;
		   int tcount =0;
		   int perpage=4;
		   int tpage=0;
		   try {
				String connectionURL = "jdbc:mysql://localhost:3306/user_register";
	            Connection connection = null;
				Statement statement = null;
                ResultSet rs = null;
                Class.forName("com.mysql.jdbc.Driver").newInstance();
                connection = DriverManager.getConnection(connectionURL, "root", "root");
                statement = connection.createStatement();
                String QueryString = "SELECT * from register";
                rs = statement.executeQuery(QueryString);
			 while (rs.next()) {		
				tcount++;
				 empObj = new Employee ();
				 empObj.setFirstName(rs.getString("firstname"));
				 empObj.setLastName(rs.getString("lastname"));
				 empObj.setUsername(rs.getString("username"));
				 empObj.setEmail(rs.getString("email"));
				 empObj.setCountry(rs.getString("country"));
				 empList.add(empObj);
			}
   
			rs.close();
			statement.close();
					connection.close();
				} 
    catch (Exception ex) {
            System.out.println("Unable to connect to batabase."+ex);
        }
   fromIndex = (int) DataGridParameters.getDataGridPageIndex (request, "datagrid1");
   if ((toIndex = fromIndex+4) >= empList.size ())
  toIndex = empList.size();
   request.setAttribute ("empList", empList.subList(fromIndex, toIndex));

pageContext.setAttribute("tCount", tcount);
%>
  
   <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">

<ui:dataGrid items="${empList}" var="employee" name="datagrid1" cellPadding="0" 
    cellSpacing="0" styleClass="datagrid" >
  <columns>
  
    <column width="50">
      <header value="" hAlign="left" styleClass="header"/>
      
      
     
    </column>

</columns>
  <rows          styleClass="rows" hiliteStyleClass="hiliterows"/>
  <alternateRows styleClass="alternaterows"/>

<tr>
<td align="left" width="33%">
<c:if test="${previous != null}">
<a href="<c:out value="${previous}"/>">Previous</a>
</c:if> 
</td>
<td align="center" width="33%">
<c:forEach items="${pages}" var="page">
<c:choose>
  <c:when test="${page.current}">
    <b><a href="<c:out value="${page.url}"/>"><c:out value="${page.index}"/></a></b>
  </c:when>
  <c:otherwise>
    <a href="<c:out value="${page.url}"/>"><c:out value="${page.index}"/></a>
  </c:otherwise>
</c:choose>
</c:forEach>
</td>
<td align="right" width="33%"> 
<c:if test="${next != null}">
<a href="<c:out value="${next}"/>">Next</a>
</c:if>
</td>
</tr>
</table>
</body>
</html>