On Mon, Jan 3, 2011 at 11:17 PM, mike s <mikescal...@hotmail.com> wrote:

> Mac OSX 10.6.5
> ValueError: No backend available

Be sure that the libusb dynamic library can be found by the loader.
Try
  export DYLD_LIBRARY_PATH=/path/to/the/lib_directory
otherwise

Cheers,
Manu

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