NullPointerException - Create New Attachment to Message Payload

Question

in PI 7.1, I am trying to add a new attachment to the Message using the following code.
A NullPointerException is recieved when statement <msg.addAttachment(text);> is executed.
Message msg = (Message) inputModuleData.getPrincipalData();
TextPayload text = msg.createTextPayload();
text.setContentType("text/plain;filename=\"Instrucoes.txt\"");
text.setContent(message.getBytes("UTF-8"));
text.setText("Set Text");
text.setDescription("Set Description");
text.setName("Set Name");
msg.addAttachment(text);
Has anybody experienced this problem? Or have any clues to what is causing the problem.
Thanks,
Tijo

Answer 1

Yes. Even with the following statement to build up the new payload. It is undefined causing NullpointerException.
TextPayload text = msg.createTextPayload();
text.setContentType("text/plain;filename=\"Instrucoes.txt\"");
text.setContent(message.getBytes("UTF-8"));
text.setText("Set Text");
text.setDescription("Set Description");
text.setName("Set Name");