USB descriptor for stereo recorder

Hi all,

I am implementing a stereo recroder application. The application should send the recorded data
over USB to host application (e.g. Audacity,).
I succeeded to make the recorder to "record" propperly and now I am stuck at USB communcation and specifically at USB descriptor.
I started from the example provided in Audio spec appendix B "USB microphone" (page 105) and I am trying to make it stereo channel and 48KHz but I get at windows I got error code = 10.
Here below the descriptor. Can you tell me where I can find the error?

u8 Descritpr[100] =
{ 0x09, /* bLength */

USB_CONFIGURATION_DESCRIPTOR_TYPE, /* bDescriptorType */

LOBYTE(AUDIO_CONFIG_DESC_SIZE), /* wTotalLength */

HIBYTE(AUDIO_CONFIG_DESC_SIZE),

0x02, /* bNumInterfaces */

0x01, /* bConfigurationValue */

0x00, /* iConfiguration */

0x80, /* bmAttributes BUS Powred*/

0x0A, /* bMaxPower = 100 mA*/

/* USB Speaker Standard AC Interface descriptor */

0x09,

0x04,

0x00,

0x00,

0x00,

0x01,

0x01,

0x00,

0x00,

/* Class specific AC interface descriptor */ 0x09,

0x24,

0x01,

0x00,/* bcdADC */

0x01,

0x1E,/* wTotalLength */

0x00,

0x01, /* bInCollection */

0x01, /* baInterfaceNr(1) */

/* Input Terminal Descriptor */

0x0C, /* bLength */

0x24, /* bDescriptorType */

0x02, /* bDescriptorSubType */

0x01, /* bTerminalID */

0x01, /* wTerminalType */

0x02, /* wTerminalType */

0x00, /* bAssocTerminal */

0x01, /* bNrChannels */

0x00, /* wChannelConfig */

0x00, /* wChannelConfig */

0x00, /* iChannelName */

0x00, /* iTerminal */

/* Output Terminal Descriptor */

0x09, /* bLength */

0x24, /* bDescriptorType */

0x03, /* bDescriptorSubType */

0x02, /* bTerminalID */

0x01, /* wTerminalType */

0x01, /* wTerminalType */

0x00, /* bAssocTerminal */

0x01, /* bNrChannels */

0x00, /* wChannelConfig */

/* Standard AS Interface Descriptor (Alt. Set. 0) */

0x09, /* bLength */

0x04, /* bDescriptorType */

0x01, /* bInterfaceNum */

0x00, /* bAlternateSetting */

0x00, /* bNumEndpoints */

0x01, /* bInterfaceClass */

0x02, /* bInterfaceSubClass */

0x00, /* bInterfaceProtocol */

0x00, /* iInterface */

/* Standard AS Interface Descriptor (Alt. Set. 1) */

0x09, /* bLength */

0x04, /* bDescriptorType */

0x01, /* bInterfaceNum */

0x01, /* bAlternateSetting */

0x01, /* bNumEndpoints */

0x01, /* bInterfaceClass */

0x02, /* bInterfaceSubClass */

0x00, /* bInterfaceProtocol */

0x00, /* iInterface */

/* Class specific AS General Interface Descriptor */

0x07, /* bLength */

0x24, /* bDescriptorType */

0x01, /* bDescriptorSubType */

0x02, /* bTerminalLink */

0x01, /* bDelay */

0x01, /* wFormatTag */

0x00, /* wFormatTag */

/* Foramt Type Descriptor */

0x0B,

0x24,

0x02,

0x01,

0x01,

0x02,

0x10,

0x01,

0x40,

0x1F,

0x00,

/* Endpoint Descriptor */

0x09, /* bLength */

0x05, /* bDescriptorType */

0x83, /* bEndpointAddress */

0x01, /* bmAttributes */

0x10, /* wMaxPacketSize */

0x00, /* wMaxPacketSize */

0x01, /* bInterval */

0x00, /* bRefresh */

0x00, /* bSynchAddress */

/* Audio Data Endpoint Descriptor */

0x07,

0x25,

0x01,

0x00,

0x00,

0x00,

0x00,
};