ClassReader exception due to bad bytecode

After using ASM 3.2 for the bytecode instrumentation, I tried to verify the result by feeding the transformed bytecode to ClassReader and invoking ASMifierClassVisitor:
.........
cr = new ClassReader(originalBytes);
cw = new ClassWriter(cr,ClassWriter.COMPUTE_MAXS);
BciClassAdapter bca = new BciClassAdapter(cw, iClass);
cr.accept(bca, 0);
byte[] newBytes = cw.toByteArray();

ClassReader cr = new ClassReader(newBytes);  
File tmpFile = new File(fileName);
File tmpDir = tmpFile.getParentFile();
tmpDir.mkdirs();
ClassVisitor cv = new ASMifierClassVisitor(new PrintWriter(tmpFile));
cr.accept(cv, 0);
........

I got ClassReader Exception when processing "newBytes":

java.lang.ArrayIndexOutOfBoundsException: Array index out of range: 51966   
 at com.bv.asm.ClassReader.readUTF8(ClassReader.java:1946)                 
 at com.bv.asm.ClassReader.readClass(ClassReader.java:2015)                
 at com.bv.asm.ClassReader.getClassName(ClassReader.java:229)              
 at com.bv.bci.instrument.InstrumentClass.verify(InstrumentClass.java:287) 

Apparently ClassReader was not able to parse "newBytes", I assumed that "newBytes" was ill-formated due to some kind of problem in my bytecode instrumenation, but I could not locate the error. I used ClassWriter.COMPUTE_MAXS, but it did not help. Please advice. Thanks

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