I can confirm that I am currently struggling with getting Grass7 tools to
work in 2.16.3, as well.

Has anyone figured out how to fix this? I¹ve been on StackExchange for
about 3 hours, now.

In F,L&T,
Stace Maples 
Geospatial Manager 
Stanford Geospatial Center
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"I have a map of the United States... actual size.
It says, "Scale: 1 mile = 1 mile."
I spent last summer folding it."
-Steven Wright-

On 10/11/16, 7:06 AM, "Qgis-user on behalf of William Kyngesburye"
<qgis-user-boun...@lists.osgeo.org on behalf of wokl...@kyngchaos.com>

>Install 2.16.3, this should fix GRASS problems.
>> On Oct 11, 2016, at 8:07 AM, wkent <wk...@medinaco.org> wrote:
>> I can run GRASS commands through the GRASS toolbox (using the GRASS
>>plugin); but I am unable to run them through the Processing Toolbox.  I
>>get the "This algorithm cannot be run :-(" error, and the QGIS log shows:
>> 2016-10-11T09:02:12  0       GRASS GIS 7 execution console output
>>                      /bin/sh: grass70: command not found
>>                      /bin/sh: grass70: command not found
>> I have set the paths in both the Processing Toolbox options, and the
>>GRASS Plugin options, to /Applications/QGIS.app/Contents/MacOS/grass7.
>> In regards to the crash I get when trying to add an existing GRASS
>>layer (vector or raster) from the Browser panel to the Layers panel, the
>>attached text file is the crash report that was generated.
>> Thanks so much for your help!
>> On 2016-10-07 5:51 pm, William Kyngesburye wrote:
>>> Loading GRASS data and using the GRASS toolbox are separate from using
>>> GRASS "algorithms" in the Processing plugin.
>>> The Processing plugin needs to know where GRASS is (set in Processing
>>> options, but defaults to bundled GRASS 7), and runs GRASS commands in
>>> a separate process than QGIS (should not crash QGIS).
>>> Loading GRASS data in QGIS needs no configuration of a GRASS path
>>> (this could crash QGIS if there is a bug or build problem).  Running
>>> GRASS modules does need configuration, but this also defaults to the
>>> bundled GRASS 7.  There is also a "general" GRASS option for the GRASS
>>> installation path, but this seems to default to the compiled GRASS
>>> location.  You can try setting this to the QGIS app:
>>>  /Applications/QGIS.app/Contents/MacOS/grass7
>>> If you still get a crash, a copy of the crash log would help figure
>>> out what's wrong.
>>>> On Oct 7, 2016, at 1:30 PM, wkent <wk...@medinaco.org> wrote:
>>>> On 2016-09-29 8:45 am, Howard Frederick wrote:
>>>>> Recently upgraded to 2.16 - but cannot enable GRASS in the
>>>>>Processing configuration. Any ideas how to make this work?
>>>>> The folder seems to be correctly indicated in the config:
>>>>> This (and alternatives like ending as grass7/ ) give "This algorithm
>>>>>cannot be run :-(".
>>>>> Version: QGIS 2.16.2, on OS X 10.10.5.
>>>> Same error here, except running OS X 10.11.6.  It seems to be a path
>>>>issue, although I have not been able to determine where the path is
>>>> Additionally, while QGIS is able to locate and open my existing GRASS
>>>>locations/mapsets, when I click on a GRASS layer in the browser panel
>>>>to add to the layers panel, QGIS crashes.
>>>> _______________________________________________
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>>> -----
>>> William Kyngesburye <kyngchaos*at*kyngchaos*dot*com>
>>> http://www.kyngchaos.com/
>>> "Those people who most want to rule people are, ipso-facto, those
>>> least suited to do it."
>>> - A rule of the universe, from the HitchHiker's Guide to the Galaxy
>> <qgis_2-16-2_crash_report_loading_grass_layer.txt>
>William Kyngesburye <kyngchaos*at*kyngchaos*dot*com>
>"We can die but once, and that once we must die.  To be always fearing,
>then, would not avert it, and would make life miserable."
>- Tarzan, on death
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