com.imsl.chart

I have a file "SampleSalesTransform.java" :

[CODE]
import com.imsl.chart.JFrameChart;
import com.imsl.chart.xml.ChartXML;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.dom.DOMResult;
import org.w3c.dom.Document;

public class SampleSalesTransform {
public static void main(String argv[]) throws Exception {
String filenameXSL = argv[0];
String filenameXML = argv[1];

// Create an XML parser factory
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setNamespaceAware(true);
DocumentBuilder builder = factory.newDocumentBuilder();

// Parse the XSL file as an XML file
Document docXSL = builder.parse(filenameXSL);
DOMSource sourceXSL = new DOMSource(docXSL);
sourceXSL.setSystemId(filenameXSL);

// Create a transformation based on the XSL file
TransformerFactory tFactory = TransformerFactory.newInstance();
Transformer transformer = tFactory.newTransformer(sourceXSL);

// Parse the input XML file
Document docXML = builder.parse(filenameXML);
DOMSource sourceXML = new DOMSource(docXML);
sourceXML.setSystemId(filenameXML);

// Transform the input XML file using the XSL transformer
DOMResult result = new DOMResult();
transformer.transform(sourceXML, result);

// Create a chart from the transformed XML
//ChartXML chartXML = new ChartXML((Document)result.getNode());
//new JFrameChart(chartXML.getChart()).show();
}
}

CODE]

but when I try to compile it, it gives the following error :
"package com.imsl.chart does not exist"

what is wrong ?