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Trouble opening device interface...

I'm trying to open the device interface for my USB device and I wrote some code to do it

    ioReturnValue = IOCreatePlugInInterfaceForService ( usbDevice ,
                                                kIOUSBDeviceUserClientTypeID ,
                                                kIOCFPlugInInterfaceID ,
                                                &plugInInterface ,
                                                &score );

The error I get is 0xe00002c7, which I don't understand in this context. It's a valid USB device and it has a device interface. If I substitute HID for USB 

    ioReturnValue = IOCreatePlugInInterfaceForService ( usbDevice ,
                                                kIOHIDDeviceUserClientTypeID ,
                                                kIOCFPlugInInterfaceID ,
                                                &plugInInterface ,
                                                &score );

the code works fine. But I don't have access to the nifty routines to get the report I need from the device. What am I doing wrong?
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