Help:NoSuchMethodError thrown when reading excel sheet using jxl API

I'm trying to read data from an Excel-2003 sheet using this code:
15. File file = new File("EmpDetails.xls");
16. jxl.Workbook workbook = jxl.Workbook.getWorkbook(file);
17. jxl.Sheet sheet = workbook.getSheet(0);
18. jxl.Cell cell1 = sheet.getCell(0,0);I'm getting this java.lang.NoSuchMethodError: common.Assert.verify(Z)V. The StackTrace is given below:
Exception in thread "main" java.lang.NoSuchMethodError: common.Assert.verify(Z)V
     at jxl.read.biff.SSTRecord.getString(SSTRecord.java:417)
     at jxl.read.biff.LabelSSTRecord.<init>(LabelSSTRecord.java:56)
     at jxl.read.biff.SheetReader.read(SheetReader.java:306)
     at jxl.read.biff.SheetImpl.readSheet(SheetImpl.java:611)
     at jxl.read.biff.WorkbookParser.getSheet(WorkbookParser.java:204)
     at com.scjp.IO.ExcelJXL.main(ExcelJXL.java:17)Please help.

Thanks a lot for the reply.
I had both jxl.jar and xlrd.jar in the classpath and xlrd.jar was loaded before jxl.jar.
There is a conflicting common.Assert.class file in xlrd.jar and there is no verify method in it.
That was creating the problem. I loaded the jxl.jar file before the xlrd.jar and it is working fine.
Thanks a lot for the help!!! :)

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