Kaltura_Client_Exception thrown

Invalid KS "NTdmYmEyMGYwMjljZjRkY2UxMGEwM2QwOGExYWI1N2Q5ZmJhMjEyMHwxMDE7OzE0NzUyMDY2MDg7MjsxNDc1MTIwMjA4LjMxMjY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"