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So I just installed QGIS 2.16, and when trying to run grass commands specifically r.watershed, i get the following error, Missing dependency. enter image description here

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?

enter image description here

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2 Answers 2

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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).

The 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.

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  • Hey, so I deleted the processing folder you mentioned, then deactivated Grass. R was already deactivated. But then when I hit OK in the processing options window it gives me the same error message as before. "Wrong value for parameter R folder" and when I hit cancel and reopen Processing options Grass is still activated, so my change wasn't saved. The error is weird because I didn't touch the R folder field in the first place. The error just came up after I changed the Msys folder field to C:\MinGW\msys. The problem with r.watershed still remains. Thanks for the help!
    – Craig Dsouza
    Commented Aug 5, 2016 at 16:31
  • Maybe start with removing the entry for the R folder, or change it to an existing folder. I guess you have removed QGIS Lyon already.
    – AndreJ
    Commented Aug 5, 2016 at 16:54
  • That didn't work either. Yep, uninstalled Lyon, my mistake! would it help to reinstall 2.16?
    – Craig Dsouza
    Commented Aug 5, 2016 at 18:37
  • Uninstalling Lyon was not a mistake. Without a folder for R and Grass (not Grass 7), did you get rid of the Missing R folder? If you select r.watershed, don't take the one from GRASS, but from Grass 7.
    – AndreJ
    Commented Aug 6, 2016 at 5:37
  • Hey, so I reinstalled 2.16,then removed the values for the Grass- Msys folder and R Scripts- R folder and deactivated both and didn't receive any error message. Earlier i would get an error message if I deactivated the Grass folder and then hit ok. Also tried r.watershed from Grass 7 and it works just fine. Problem solved. Just had a couple of follow up doubts. What should the default value for R folder be, in case I want to run scripts in the future? I also want to submit an answer to my question, what could I say was the main issue? Just that Grass (v6) had to be deactivated? Thanks!
    – Craig Dsouza
    Commented Aug 6, 2016 at 13:57
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Same happened to me, but what I did was to set the correct path "QGIS 2.16"instead of "QGISLY~1" and to create a placebo folder named "msys" in the expected place so the final address is "C:\Program Files\QGIS 2.16\apps\msys" and it worked. Hope this helps. Cheers.

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