I'm developing an app using the Instagram messaging / send api and am sporadically getting this error

Request

data=f'recipient={{"id":"{reply_recipient_id}"}}&message={{"text":"{rm}"}}' r = requests.post("https://graph.facebook.com/v20.0/me/messages?access_token={}".format(access_token), data=data) 

Response

{'error': {'message': '(#100) Empty text', 'type': 'OAuthException', 'code': 100, 'error_subcode': 2534052, 'fbtrace_id': 'ABtZnf58ICsDpqWwJslG2wD'}} 

Any idea on what this is?

Thanks