您好，我一直在尝试从下面的代码创建一个wav音频文件，但一直收到错误Creatingfile('fmt?')。有人可以帮我从这里出去吗？谢谢。我的日志:*2012-11-0113:33:14.183NovocaineiOS示例[7456:c07]URL:file://localhost/Users/pier/Library/Application%20Support/iPhone%20Simulator/6.0/Applications/01EBF2C0-2C3A-490D-835E-9C39A3E88E0B/Documents/testrecording.wav错误:创建文件('fm