Generating Quiver point bsased on slope and slope_direction

I have followed the tutorial on your chanel about "Analysing Terrain in Global Mapper" and have followed any sinlge step regarding to create a regular grid to get quiver points based on slopes.
My question is orientated to get an answer why I only get the high value after to aply atribute / style from terrain, no slope or slope_direction as well, even I used a DEM as based layer to make the calclulations. I am getting crazy with this, because i intented many many times withou luck....Im not getting the slope and slope_direction values to create quiver plots. Can you help me? Is any wrong with my DEM? I get the pointclauds from a UAV fly, and everything looks perfect. Thanks in advance.
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