Kaltura_Client_Exception thrown

Invalid KS "YjFjYjIwNWU1OWQxMDA1ODkxNzkzNGNiYzIyNzg3NzE2YmEwYzFhOXwxMDE7OzE0ODA5NDE1ODQ7MjsxNDgwODU1MTg0LjkzODM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"