Hi Miguel,
sorry, I have been away for a while.
My first thought is, do you have an old version of PyUSB?  And do you have 
libusb1 installed?
It is really the version /date of pyusb that is important for this issue.

Was there output to the screen or in the log file that gave a traceback 
including line number in the file?
I guess it happened around line 1626.

Cameron.


On Thursday, 15 June 2017 02:15:07 UTC+10, Miguel Iniesta wrote:
>
> Hello,
>
> Finally last weekend I could try last version of driver wmr300x.
> I did it on a computer with Ubuntu 16.04 and weewx v3.7.1.
> It doesn't work. Some errors are reported:
>
> import of driver failed: 'Device' object has no attribute 'backend' (<type 
> 'exceptions.AttributeError'>)
> engine: Unable to load driver: 'Device' object has no attribute 'backend'
>
> Log is attached but it doesn't provide much more information, though.
> Some help would be much appreciated.
>
> Thank you.
>
>
>
>
>
>

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