I'm currently having issue using lightning:conversationAgentSend from lightning:conversationToolkitAPI. In the Docs it said that "This method intercepts the message before it’s sent to the chat visitor." but so far I was able to intercept the message that was already published in the chat window.

I'm currently stuck on the first challenge. I keep getting "Challenge Not yet complete... here's what's wrong: 
The field 'Target_Close_Date__c' either does not exists on the Offer__c object or it is not of type date."
I really don't know what I'm doing wrong. 
 

I'm currently stuck on the first challenge. I keep getting "Challenge Not yet complete... here's what's wrong: 
The field 'Target_Close_Date__c' either does not exists on the Offer__c object or it is not of type date."
I really don't know what I'm doing wrong.