I am working on QGIS 3.4.9 with Mac OS Mojave 10.14.5 I have two DEM raster files and I would like to merge them. Unfortunately, an error occurs and I don't know what to do.

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    Welcome to GIS SE. As a new user, please take the Tour. Please capture both your command and error as text, and Edit the question to add them to the question body. All questions should always contain the exact error in a for that can be searched and be visible on all devices. – Vince Jul 22 '19 at 3:04
  • It is hard to tell, but maybe you can try to use the SAGA's "Mosaic raster layers" tool instead. – Shilosh Jul 22 '19 at 12:24
  • You might search Google on the error message gdal_merge.py: command not found. That provided many possibilities including this one from stackexchange: gis.stackexchange.com/questions/276853/… – johns Jul 22 '19 at 15:02

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