Internal API Error when setting custom params for campaigns

[Petros Dawit]

Hi here is a snippet of my code: 

                campaign_service = self.get_service(CAMPAIGN_SERVICE)

                parameters = [

                    {

                        'key': 'refcode',

                        'value': refcode

                    }

                ]

                campaign_operations = []

                for campaign in campaigns:

                    campaign_operations.append({

                        'operator': 'SET',

                        'operand': {

                            'name': campaign,

                            'urlCustomParameters': {'parameters': parameters}

                        }

                    })

                response = campaign_service.mutate(campaign_operations)

                return response

The campaigns is a list of campaigns that are currently serving. I am now getting back an Internal API Error when b4, this same code didn't have that issue. Any help would be appreciated.

Thanks