jena programming error while reading from an input file .rdf.......Please guide me

package sample;

import java.io.InputStream;

import com.hp.hpl.jena.rdf.model.Model;
import com.hp.hpl.jena.rdf.model.ModelFactory;
import com.hp.hpl.jena.util.FileManager;

public class ReadRDF extends Object {

    static final String fileName = "foaf-ijd.rdf";

    public static void main(String[] args) {

        Model model = ModelFactory.createDefaultModel();

        InputStream in = FileManager.get().open(fileName);

        if (in == null) {
            throw new IllegalArgumentException("File: " + fileName
                    + " not found");
        }

        model.read(in, "");

        model.write(System.out);

    }
}

Errors getting populated

Exception in thread "main" java.lang.NoSuchMethodError: org.slf4j.Logger.isTraceEnabled()Z at com.hp.hpl.jena.util.LocatorFi开发者_JAVA技巧le.open(LocatorFile.java:118) at com.hp.hpl.jena.util.FileManager.openNoMapOrNull(FileManager.java:527) at com.hp.hpl.jena.util.FileManager.openNoMap(FileManager.java:510) at com.hp.hpl.jena.util.LocationMapper.initFromPath(LocationMapper.java:132) at com.hp.hpl.jena.util.LocationMapper.get(LocationMapper.java:61) at com.hp.hpl.jena.util.FileManager.makeGlobal(FileManager.java:116) at com.hp.hpl.jena.util.FileManager.get(FileManager.java:82) at sample.ReadRDF.main(ReadRDF.java:17)

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This error can apper, if you don't add to CLASSPATH all jar file from /lib dir in Jena ditrib. Also, if version's slf4j, which you use, an d jena's slf4j is differenf, this error can appear.