SharePoint Meta-data

Hi Team , I am working on an application where we are uploading a file from Mendix to share Point . Once upload is done i am getting ID in return and with that ID i am trying to send the meta data of the document in json format .  However i am getting one error  {"error":{"code":"-1, System.Collections.Generic.KeyNotFoundException","message":{"lang":"en-US","value":"The given key was not present in the dictionary."}}} Can some one help me in this s
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