Validation error

[lbpublisys]

Hi, since the last release when sending the report from the client I get the following error:
Invalid Input [Unable to deliver the submission to at least one recipient]
and in the console:

{
    "error_message": "Invalid Input [Unable to deliver the submission to at least one recipient]",
    "error_code": 3,
    "arguments": [
        "Unable to deliver the submission to at least one recipient"
    ]
}

Can someone help me??