Error on Publish Offer: "message": "Invalid value for ."

[maphil6778]

{
"errors": [

I'm able to create the inventory, create the offer for the sku. 
Then I can check the offer status. 
But when I try to publish, I get this error, but no description of what the . is for. 

{
"errorId": 25709,
"domain": "API_INVENTORY",
"subdomain": "Selling",
"category": "REQUEST",
"message": "Invalid value for ."
}
]
}