Ubuntu 16.04 issue

[sildeag]

• installing source package ‘spacetime’ ... * R * data * demo * inst * tests * preparing package for lazy loading in method for ‘coerce’ with signature ‘"RasterStackBrick","STFDF"’: no definition for class “RasterStackBrick” in method for ‘coerce’ with signature ‘"STFDF","RasterBrick"’: no definition for class “RasterBrick” in method for ‘stplot’ with signature ‘"RasterStackBrick"’: no definition for class “RasterStackBrick”

What am I missing?

[edzer]

You can safely ignore these messages.