Component Map View2D function error - California Housing example

[is0soares]

While replicating the California housing SOM example the following error occurred in the View2D function:

The number of rows generated by the View2D function is not an integer, as it should be. I tried different values for the View2D function parameters, and the error remained.
Also, I upgrade the matplotlib package to the most recent and the sompy package used is the one available on this page.

I'm trying to use this sompy package for an investigation project, and so, I would like to know if this error has occurred before, or if there is any way of solving it.