Kaltura_Client_Exception thrown

Invalid KS "MzE5MmYxZmJmNTQ1NDljZjE2OTk3ZTg0MjQ2ZTMwNmMwZDEzMjA1YXwxMDE7OzE0OTU5NDY0OTM7MjsxNDk1ODYwMDkzLjMyNTQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"