R.mapcalc doesn't create anything

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I have to calculate a NDVI raster with 2 landsat maps. The formula is as following :



The problem is that it doesnt show up in my layer list and when i try to export it from GRASS via r.out.gdall.gtiff, i get this:



My colleagues also get this message but they don't have the "Unable to create dataset using driver" part, and it works well on their computer.

I used both Qgis 2.12 Lyon and 2.8.3 Wien and it does the same thing. Can you guys help me to fix this please ?



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