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Loaded an .osm file using Add Vector layer. When trying to use the layer with ftools tools, the following error is shown:



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Uncaught error while executing algorithm

Traceback (most recent call last):

Traceback (most recent call last):

File "C:/Users/Anita/.qgis2/python/plugins\\processing\\core\\GeoAlgorithm.py", line 202, in execute

self.processAlgorithm(progress)

File "C:/Users/Anita/.qgis2/python/plugins\\processing\\algs\\ftools\\FixedDistanceBuffer.py", line 79, in processAlgorithm

dissolve, segments)

File "C:/Users/Anita/.qgis2/python/plugins\\processing\\algs\\ftools\\Buffer.py", line 46, in buffering

total = 100.0 / float(len(features))

ValueError: __len__() should return >= 0

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