Kaltura_Client_Exception thrown

Invalid KS "ZmFiYzcwMWY1ZjllNmFkNzI0ZTlkMmJjZGFmNDg3MGVkNjhmNTFhM3wxMDE7OzE0NzUwNzgyNjE7MjsxNDc0OTkxODYxLjE5Mzk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"