Kaltura_Client_Exception thrown

Invalid KS "ZmJhMTRiZTllZWE0ZjY5YWQ3YmExNjhlZWEwZmM4YmZjYzEyYmZiNnwxMDE7OzE0OTU5MTI5NTI7MjsxNDk1ODI2NTUyLjEzNzQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"