error while validing and permission errors ??

[Jorid]

when i try to run dfu-programmer as root i get 2 different error messages
each time I try to run the program


# dfu-programmer openpcd dump
looking for 16c0:076b
determining device status: state = 10, status = 8
dfuERROR, clearing status
looking for 16c0:076b
dfu-programmer: failed to claim interface.  Check permissions.


# dfu-programmer openpcd dump
looking for 16c0:076b
determining device status: state = 2, status = 0
dfuIDLE, continuing
wTransferSize = 0x0100
dfu_download error -32
Error while validating.


the same thing happens when i want to erase:

$ sudo dfu-programmer openpcd erase
looking for 16c0:076b
determining device status: state = 10, status = 8
dfuERROR, clearing status
looking for 16c0:076b
dfu-programmer: failed to claim interface.  Check permissions.

$ sudo dfu-programmer openpcd erase
looking for 16c0:076b
determining device status: state = 2, status = 0
dfuIDLE, continuing
wTransferSize = 0x0100
dfu_download error -32
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