Not generating nzbs

[scriptzteam]

Traceback (most recent call last):
File "/var/www/html/private/newsmangler-master/mangler.py", line 148, in
main()
File "/var/www/html/private/newsmangler-master/mangler.py", line 143, in main
poster.post(newsgroup, postme, post_title=post_title)
File "/var/www/html/private/newsmangler-master/newsmangler/postmangler.py", line 187, in post
self.generate_nzb()
File "/var/www/html/private/newsmangler-master/newsmangler/postmangler.py", line 363, in generate_nzb
segment.text = str(article.headers['Message-ID'][1:-1])
KeyError: 'Message-ID'