Getting error while uploading the data from the dropbox API to knack api

I am trying to upload a processed datafile from the dropbox to the knack API. I have set up the dropbox access tokens and the Knack api’s access tokens in my code, but I am not able to insert the records into the Knack table. I am getting this error Error uploading data to Knack: 404

Cannot POST /umich-saverx/saverx/schema/list/objects/object_4/fields
. Could someone help me out in this regard.