Messenger Chatbot Error validating access token: The user is enrolled in a blocking, logged-in checkpoint

I recently submitted a messenger chatbot for review. Few minutes after the submission, I couldn't deploy new changes from github anymore. The bot uses nodejs and is hosted on heroku. Also, when I send a message to the bot, I got the following error. Is this normal?

 Received message for user 14564321654 and page 155648972 at 1324654987 with message:
2017-04-29T11:23:58.965612+00:00 app[web.1]: {"sender":{"id":"1871475959545200"},"recipient":{"id":"294669640946043"},"timestamp":1493465037568,"message":{"mid":"mid.$cAAFW8wXro_Fh6rlDAFbuXP9w1a8x","seq":268951,"text":"didnt really find a solution"}}
2017-04-29T11:23:59.004344+00:00 app[web.1]: Error:  { message: 'Error validating access token: The user is enrolled in a blocking, logged-in checkpoint',
2017-04-29T11:23:59.004347+00:00 app[web.1]:   type: 'OAuthException',
2017-04-29T11:23:59.004347+00:00 app[web.1]:   code: 190,
2017-04-29T11:23:59.004348+00:00 app[web.1]:   error_subcode: 490,
2017-04-29T11:23:59.004348+00:00 app[web.1]:   fbtrace_id: 'ABxgp5w04rf' }

via TSR