Plotting curvature of a surface

Hello, I am trying to plot the curvature of the surface (attached) using patch_curvature https://www.mathworks.com/matlabcentral/fileexchange/32573-patch-curvature

I get the following error when I run it:

> In patchcurvature>VectorRotationMatrix (line 246)
  In patchcurvature (line 94) 
Warning: Matrix is singular, close to singular or badly scaled. Results may be inaccurate. RCOND = NaN. 
> In patchcurvature>VectorRotationMatrix (line 246)
  In patchcurvature (line 94) 
Warning: Matrix is singular, close to singular or badly scaled. Results may be inaccurate. RCOND = NaN. 
> In patchcurvature>VectorRotationMatrix (line 246)
  In patchcurvature (line 94) 
Warning: Matrix is singular, close to singular or badly scaled. Results may be inaccurate. RCOND = NaN. 
> In patchcurvature>VectorRotationMatrix (line 246)
  In patchcurvature (line 94) 
Warning: Matrix is singular, close to singular or badly scaled. Results may be inaccurate. RCOND = NaN. 
> In patchcurvature>VectorRotationMatrix (line 246)
  In patchcurvature (line 94)

Can anybody help me please?

Thanks!