powershell script to sync with mailchimp

I am trying to migrate my contacts from office to mailchimp using (an heavily modified version) of the script in this article [login to view URL] However, i am facing some errors while using a powershell script to do it . I'll be able to provide the script here is the error message Invoke-RestMethod : {"type":"[login to view URL] ors/","title":"Invalid Resource","status":400,"detail":"The resource submitted could not be validated. For field-specific details, see the 'errors' array.","i nstance":"aeb15e39-12b7-4458-57e2-67fb7140863c","errors":[{"field":"merge_field [login to view URL]","message":"Data did not match any of the schemas described in anyOf."}]} Au caractère D:\Program Files\Ampps\www\mailchimp\ethiopie\[login to view URL] : 17 + ... tchresult = Invoke-RestMethod -URI $baseUri/3.0/lists/$listId -Method ... + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : InvalidOperation : ([login to view URL]:Ht tpWebRequest) [Invoke-RestMethod], WebException + FullyQualifiedErrorId : WebCmdletWebResponseException,[login to view URL] [login to view URL] I've removed all special characters and made sure that all the fields have a default value, using the code below