PATHHardware Documentation > USB Devices > Mac OS USB DDK API Reference

USL Error Codes

Error codes returned by the USL are in the range -6900 to -6999 as listed in Table 2.

**Table 2 Error definitions**
Error constant	Number	Definition
`kUSBNoErr`	`0`	No error occurred
`kUSBInternalErr`	`-6999`	Internal error
`kUSBUnknownDeviceErr`	`-6998`	Device reference not recognized
`kUSBUnknownPipeErr`	`-6997`	Pipe reference not recognized
`kUSBTooManyPipesErr`	`-6996`	Too many pipes
`kUSBIncorrectTypeErr`	`-6995`	Incorrect type specified
`kUSBRqErr`	`-6994`	Request error
`kUSBUnknownRequestErr`	`-6993`	Unknown request
`kUSBTooManyTransactionsErr`	`-6992`	Too many transactions
`kUSBAlreadyOpenErr`	`-6991`	Device already open
`kUSBNoDeviceErr`	`-6990`	No device
`kUSBDeviceErr`	`-6989`	Device error
`kUSBOutOfMemoryErr`	`-6988`	Out of memory
`kUSBNotFound`	`-6987`	USB not found
`kUSBPBVersionError`	`-6986`	Wrong parameter block version
`kUSBPBLengthError`	`-6985`	pbLength too small
`kUSBCompletionError`	`-6984`	No completion routine specified
`kUSBFlagsError`	`-6983`	Flags not initialized to 0
`kUSBAbortedError`	`-6982`	Pipe aborted
`kUSBNoBandwidthError`	`-6981`	Not enough bandwidth available
`kUSBPipeIdleError`	`-6980`	Pipe is idle; it cannot accept transactions
`kUSBPipeStalledError`	`-6979`	Pipe has stalled; it cannot be used until the error is cleared with a `USBClearPipeStallByReference` call
`kUSBUnknownInterfaceErr`	`-6978`	Interface reference not recognized
`kUSBDeviceBusy`	`-6977`	Device is already being configured
`kUSBDevicePowerProblem`	`-6976`	Device has a power problem
kUSBLinkErr	`-6916`	Link error
`kUSBCRCErr`	`-6915`	Pipe stall: bad CRC
`kUSBBitstufErr`	`-6914`	Pipe stall: bitstuffing
`kUSBDataToggleErr`	`-6913`	Pipe stall: bad data toggle
`kUSBEndpointStallErr`	`-6912`	Device didn't understand
`kUSBNotRespondingErr`	`-6911`	Pipe stall, no device, or device hung
`kUSBPIDCheckErr`	`-6910`	Pipe stall: PID CRC error
`kUSBWrongPIDErr`	`-6909`	Pipe stall: Bad or wrong PID
`kUSBOverRunErr`	`-6908`	Packet too large or more data than buffer
`kUSBUnderRunErr`	`-6907`	Less data than buffer
`kUSBBufOvrRunErr`	`-6904`	Host hardware failure on data in
`kUSBBufUnderRunErr`	`-6903`	Host hardware failure on data out
`kUSBNotSent1Err`	`-6902`	Transaction not sent
`kUSBNotSent2Err`	`-6901`	Transaction not sent

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