java.lang.IndexOutOfBoundsException: Index: 1, Size: 1

I have a Groovyscript to get data from an excel file in a soapui massage.

 

Groovy script:

import com.eviware.soapui.model.*;
import com.eviware.soapui.model.testsuite.Assertable;
import com.eviware.soapui.support.XmlHolder;
import java.io.File;
import java.util.*;
import jxl.write.*;
import jxl.*;
def regLogger =
   org.apache.log4j.Logger.getLogger("RegresssionTestLogger");
def groovyUtils = new com.eviware.soapui.support.GroovyUtils(context)
def properties = new java.util.Properties();
//context.expand('${Properties#propertyname}'

def s2;
def s3=(testRunner.testCase.getPropertyValue("RUN"));
def a1;

regLogger.info (s3);
if (s3 != "1" && s3 != "2" && s3 != '3')
{
 testRunner.testCase.setPropertyValue("RUN", '1');
 s3=(testRunner.testCase.getPropertyValue("RUN"));
}

Workbook workbook = Workbook.getWorkbook(new File("C:\\Data\\SoapUI_Excel_Files\\Test1.xls"));
for (count in 1..< 11)
// this is form row 1 to row 11 based on the numbers of properties that
// you have in the excel sheet in this case the value is 10
{
 Sheet sheet = workbook.getSheet(1);
 Cell al = sheet.getCell(count,0); // getCell(row,column)-place some value in myfile.xls
 Cell b2 = sheet.getCell (count,s3.toInteger());  // value will be acessed using a1,b2 & c3 Cell
 println a1;
 println b2;
 String s1 = a1.getContents();
 s2 = b2.getContents();
 testRunner.testCase.setPropertyValue(s1,s2);
}
workbook.close();

 

error message:

java.lang.IndexOutOfBoundsException: Index: 1, Size: 1

error at line: 30

 

The only sheet in the excel is Sheet1

 

Can any one help me to fix this issue?