which seemed to be similar to this issue QGIS 2.14 standalone GRASS provider missing Msys folder, can't execute tools so I tried out the solution 'aQGISuser' suggested and downloaded the msys base package, changed the path settings in QGIS but I still get the following error. Wrong value for parameter "R folder" Can anyone help?
It looks like you are working with an older version of the processing plugin.
Take a look into
C:\users\<username>\.qgis2\python\plugins and delete any folder named processing.
The current core version does not need the msys folder for GRASS 7 commands, only GRASS (which is GRASS 6.4.3) still needs it.
r.watershed is included in GRASS and GRASS7, so I suggest to deactivate GRASS to avoid the MSYS folder problem. The standalone QGIS 2.16.1 version does not include GRASS 6 anymore, only 7.0.4. The
Grass folder you specified would not be correct anyway, it should point to the subfolder grass-6.4.3 (if that is installed).
R folder has nothing to do with GRASS, but with scripts for R. Since you don't want to use that, you might deactivate the R data provider in the Processing options as well.