I followed this tutorial step by step.
However, when running the algorithm I get the following error:
"Horizontal spacing is too small for the covered area"
I'm using EPSG 3857 (WGS 84 Pseudo Mercator) and I'm trying to obtain a 1 HA just as stated in the question I linked. This happens whether I increase or decrease the grid extent or horizontal and vertical spacing. The same error occurs with other projections (4326, 32644, 3763)
Using QGIS 2.18.16