Custom Post type warning

Am making a new custom post for my website according to this tutorial
http://codex.ww.wp.xz.cn/Function_Reference/register_post_type
But I keep seeing an error message beside the words count
Warning: Cannot modify header information - headers already sent by (output started at C:\xampplite\htdocs\enwp\wp-content\themes\pcm\functions.php:39) in C:\xampplite\htdocs\enwp\wp-includes\classes.php on line 1601

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