Kaltura_Client_Exception thrown

Invalid KS "M2JmZGEzYmRlMDIxMDA2NGZkNjhkZjQyY2IwNzM4MDMzZWFmYmU4NHwxMDE7OzE0OTg2OTY5MjE7MjsxNDk4NjEwNTIxLjkwNzY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"