Inverse Model Generation Error

Hi, I am new to brainstorm and have been going through the Getting Started tutorials with the introduction data sets to familiarize myself with the program before I begin my own data analysis. I am running the May 9, 2017 update of Brainstorm on MATLAB R2016a

In http://neuroimage.usc.edu/brainstorm/Tutorials/SourceEstimation, I encounter the following array generation error when I attempt to generate a minimum norm constrained current density model at the beginning of the "Computing sources for single trials" section of the tutorial.

To the best of my knowledge I have followed the instructions of the tutorials precisely up to this point and as such have no idea why the diag function is attempting to generate a 300000 x 300000 array!

Any help on fixing this error would be great.

Thanks,

Brett

The File Contents of the Overlapping Spheres model I am trying to compute sources for:

You have selected a high-resolution surface (330000 vertices) as your default surface instead of the low resolution one (15000 vertices). Go to the anatomy of your subject, double-click on the cortex_15000V, then recompute your forward and inverse models.