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Running Grass 7 plugin inside QGIS 2.18 on a mac OS 10.14.2. Trying to perform pansharpening on landsat 8 imagery.

Algorithm i.pansharpen - Image fusion algorithms to sharpen multispectral with high-res panchromatic channels starting...
g.proj -c proj4="+proj=utm +zone=19 +south +datum=WGS84 +units=m +no_defs"
r.external input="/Users/---/Documents/mac Geology/geol Argentina/satellite imagery/432/band4gt.tif" band=1 output=tmp1554997557798 --overwrite -o
r.external input="/Users/---/Documents/mac Geology/geol Argentina/satellite imagery/432/band3gt.tif" band=1 output=tmp1554997557799 --overwrite -o
r.external input="/Users/---/Documents/mac Geology/geol Argentina/satellite imagery/432/band2gt.tif" band=1 output=tmp15549975577910 --overwrite -o
r.external input="/Users/---/Documents/mac Geology/geol Argentina/satellite imagery/band8-0/band8/a_LC08_L1TP_232076_20190321_20190321_01_RT_B81.tif" band=1 output=tmp15549975577911 --overwrite -o
g.region n=-2637956.96475 s=-2654735.1564 e=793732.923015 w=778552.654376 res=30.0
i.pansharpen red="tmp1554997557798" green="tmp1554997557799" blue="tmp15549975577910" pan="tmp15549975577911" method=brovey output="tmp15549975577912" --overwrite
r.out.gdal -c -t -f --overwrite createopt="TFW=YES,COMPRESS=LZW" input=tmp15549975577912_red output="/Users/---/Documents/mac Geology/geol Argentina/satellite imagery/test2/SCP_band4_pano.tif"
r.out.gdal -c -t -f --overwrite createopt="TFW=YES,COMPRESS=LZW" input=tmp15549975577912_green output="/Users/---/Documents/mac Geology/geol Argentina/satellite imagery/test2/SCP_band3_pano.tif"
r.out.gdal -c -t -f --overwrite createopt="TFW=YES,COMPRESS=LZW" input=tmp15549975577912_blue output="/Users/---/Documents/mac Geology/geol Argentina/satellite imagery/test2/SCP_band2_pano.tif"
Rebuilding Addon HTML manual pages index... 
Rebuilding Addon menu... 
Default locale settings are missing. GRASS running with C locale.Starting GRASS GIS... 
Executing ... 
Default region was updated to the new projection, but if you have multiple mapsets `g.region -d` should be run in each to update the region from the default 
Projection information updated 
Over-riding projection check 
Reading band 1 of 1... 
Link to raster map created. 
Over-riding projection check 
Reading band 1 of 1... 
Link to raster map created. 
Over-riding projection check 
Reading band 1 of 1... 
Link to raster map created. 
Over-riding projection check 
Reading band 1 of 1... 
Link to raster map created. 
Performing pan sharpening with hi res pan image: 15.000000 
Histogram matching... 
0..3..6..9..12..15..18..21..24..27..30..33..36..39..42..45..48..51..54..57..60..63..66..69..72..75..78..81..84..87..90..93..96..99..100 
0..3..6..9..12..15..18..21..24..27..30..33..36..39..42..45..48..51..54..57..60..63..66..69..72..75..78..81..84..87..90..93..96..99..100 
ERROR: Input has no data. Check region settings. 
ERROR: Raster map or group not found 
ERROR: Raster map or group not found 
ERROR: Raster map or group not found 
Execution of finished. 
Cleaning up temporary files... 
Default locale not found, using UTF-8 
Rebuilding Addon HTML manual pages index... 
Rebuilding Addon menu... 
Default locale settings are missing. GRASS running with C locale.Starting GRASS GIS... 
Executing ... 
ERROR: Raster map or group not found 
ERROR: Raster map or group not found 
ERROR: Raster map or group not found 
Execution of finished. 
Cleaning up temporary files... 
Default locale not found, using UTF-8 
Converting outputs
Loading resulting layers

The following layers were not correctly generated.
Enhanced Red
Enhanced Green
Enhanced Blue
You can check the log messages to find more information about the execution of the algorithm

Why do I get these error messages?

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