Kaltura_Client_Exception thrown

Invalid KS "NDEwYTg4YWE0ZGNiMmY2ZDliM2ZhMjFhOTUxODQ3ZjZkYWI4OTNmNXwxMDE7OzE0ODA4NDQ3MTc7MjsxNDgwNzU4MzE3LjM2MDc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"