Why UnsupportedOperationException after byte code instrumentation using ASM

Hi All,
I am getting an run time exception while trying to profile java class after byte code instrumenation using ASM 3.0.
Error is like :
java.lang.UnsupportedOperationException: This parser does not support specification "null" version "null"
at javax.xml.parsers.SAXParser.getSchema(Unknown Source)
I am trying to add byte code like this. ( I am trying to use a PrintWriter object of my class (Report) to write a Separator ( / ) in a text file and using AdviceAdaptor of ASM 3.0 )
mv.visitFieldInsn(GETSTATIC, "Report", "printWriterObj", "Ljava/io/PrintWriter;");
mv.visitLdcInsn("/");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/io/PrintWriter", "print","(Ljava/lang/String;)V");
Please help me to resolve this issue.
write me if you need more information on this.

Dont someone has a solution, or got a similar problem ?
Thought about it could be a bug in the basic java classes of JDev 10.1.2
but i dont really know...
Have no idea left.
Sebastian

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