Kaltura_Client_Exception thrown

Invalid KS "YjY4NjFhMjY2NzllNTU5MTFiMWRiODlkZDYzN2VmNDZkNDQ2OTliMXwxMDE7OzE0Njk4ODIxMDQ7MjsxNDY5Nzk1NzA0Ljg4MDk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"