Error when using CheckClassAdapter

Hi,

I wants to verify a class which I modified using ASM. I used the code
example given in the documentation of CheckClassAdapter. But I receive an
error
 "Exception in thread "main" java.lang.NoSuchMethodError:
org.objectweb.asm.ClassReader.accept(Lorg/objectweb/asm/ClassVisitor;Z)V
        at org.objectweb.asm.util.CheckClassAdapter.verify(Unknown Source) "

I dont know why this error happens. Here is the code I used. Please tell me
what I am doing wrong here

            byte[] cl = bs.toByteArray();
            ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES);
            ClassReader cr = new ClassReader(cl);

            ClassVisitor cv = new MyCheckClassAdapter(new
CheckClassAdapter(cw));
            cr.accept(cv, 0);

             StringWriter sw = new StringWriter();
            PrintWriter pw = new PrintWriter(sw);
           CheckClassAdapter.verify(cr, true, pw);


Thank you.
-- 
Jayanga Wagaarachchi
Computer Science and Engineering
University of Moratuwa.

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