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I have used VectorFieldCalc plug-in in QGIS several times before, to make maps of marine currents from .nc satellite data. Recently, I have tried to redo some of the maps and when I try to calculate the "magnitude" and "orientation" layers, it just says that I have several bands in the same raster and it cannot calculate it. I have tried this in QGIS versions 2.18 and 3 with the same result. The .nc file that I am working with (available here) is similar to the ones I worked with before, it contains the current velocities for one particular day at one particular depth. I have also tried downloading the x and y components of the current velocities in different raster files and that doesn't work either.

What am I doing wrong?

Snapshot of VectorFieldCalc error

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