Kaltura_Client_Exception thrown

Invalid KS "ZjA1YjNhMTA4NDg0MTg2ODQzNWVjNmUxZWIxYzIwOGVjYzE1MjBlMHwxMDE7OzE0OTMyMTAzMjE7MjsxNDkzMTIzOTIxLjI2ODE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"