Kaltura_Client_Exception thrown

Invalid KS "NzJhODY0Yjk4NGI4MmZjZWMwMTZjNjg4Yzk5YjY4ODg3ZmYxYmM5OXwxMDE7OzE0OTA0NzQxNDI7MjsxNDkwMzg3NzQyLjE0MTQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"