Failed to import LineModel, ransac

Hi, When doing from ipython: print skimage.__version__ from skimage.measure import LineModel I get: ---------------------------------------------------------------------------ImportError Traceback (most recent call last)<ipython-input-55-c6b2bd2de1ce> in <module>() 1 print skimage.__version__----> 2 from skimage.measure import LineModel ImportError: cannot import name LineModel 0.9dev Is it a version problem ? Jean-Patrick