Connector error "Value cannot be null. Parameter name: key"

I am in the process of developing a connector, and am getting errors when I click on a tab that is reading metadata but not enough information in the error provided.

 

 

This is from console log:

app?v=JQ7BO0di9dzSJro2J-i4FWErm6_q9LIA6LTIEOwpy8U1:1 *** STALE FIELDS REQUEST Opportunity, time: Mon Jun 11 2018 10:07:58 GMT-0500 (Central Daylight Time)
app?v=JQ7BO0di9dzSJro2J-i4FWErm6_q9LIA6LTIEOwpy8U1:1 Success: ConnectionsService queryEntities, returning cached
app?v=JQ7BO0di9dzSJro2J-i4FWErm6_q9LIA6LTIEOwpy8U1:1 Success: ConnectionsService queryEntities
app?v=JQ7BO0di9dzSJro2J-i4FWErm6_q9LIA6LTIEOwpy8U1:1 *** STALE RELS REQUEST Opportunity, time: Mon Jun 11 2018 10:07:58 GMT-0500 (Central Daylight Time)
app?v=JQ7BO0di9dzSJro2J-i4FWErm6_q9LIA6LTIEOwpy8U1:1 Success: ConnectionsService queryEntities, returning cached
app?v=JQ7BO0di9dzSJro2J-i4FWErm6_q9LIA6LTIEOwpy8U1:1 Success: ConnectionsService queryEntities
app?v=JQ7BO0di9dzSJro2J-i4FWErm6_q9LIA6LTIEOwpy8U1:1 *** HAS pending Fields request for Entity: Opportunity, name , connectionID: fa9707ea-6457-487d-bf75-7d188e1e3928
app?v=JQ7BO0di9dzSJro2J-i4FWErm6_q9LIA6LTIEOwpy8U1:1 QueryFieldsByEntity: Already has pending entry
sbendpoint.scribesoft.com/v1/orgs/4655/connections/fa9707ea-6457-487d-bf75-7d188e1e3928/entities/Opportunity/relationships?agentId=51d3177e-af81-4fa8-adf9-175932781c7c&limit=500&offset=0:1 GET https://sbendpoint.scribesoft.com/v1/orgs/4655/connections/fa9707ea-6457-487d-bf75-7d188e1e3928/entities/Opportunity/relationships?agentId=51d3177e-af81-4fa8-adf9-175932781c7c&limit=500&offset=0 404 ()
sbendpoint.scribesoft.com/v1/orgs/4655/connections/fa9707ea-6457-487d-bf75-7d188e1e3928/entities/Opportunity/fields?agentId=51d3177e-af81-4fa8-adf9-175932781c7c&limit=500&offset=0:1 GET https://sbendpoint.scribesoft.com/v1/orgs/4655/connections/fa9707ea-6457-487d-bf75-7d188e1e3928/entities/Opportunity/fields?agentId=51d3177e-af81-4fa8-adf9-175932781c7c&limit=500&offset=0 404 ()

 

(2) Answers

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