Which messages are considered a bad message on fb messenger in secret conversation?

[Android Central Question]

My friend sent a message n before i saw it shows "sent a bad message that caused an error".

 

[jcorcione]

is there an answer to this question?

 

[Rukbat]

That means technically bad - it was formed wrong or didn't follow protocol (because it got corrupted en route). Facebook constantly has problems with one thing or another - there's nothing you can do about it. (With a bad message, you can ask the person to say it again.)