Kaltura_Client_Exception thrown

Invalid KS "MjEzMTgwMDdkMzFmOWQ5YTY5MDFkYTg5ZGNiMWIxZWJjM2NhM2FiNXwxMDE7OzE0OTYyMjUxODQ7MjsxNDk2MTM4Nzg0LjE3MTY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"