r.mblend error

[usree015]

I am using r.mblend for the first time. I imported two .asc files (high resolution of 1m and low resolution of 16m). When I try to blend them using r.mblend following error is being show. Could you please help me fix this ?

(Mon Dec 14 14:37:47 2020)
r.mblend high=HIGH_DEM low=LOW_DEM output=RESULTS
[r.mblend] Resampling low resolution raster to higher resolution
[r.mblend] Multiplying low resolution by zero
[r.mblend] Multiplying high resolution by zero
[r.mblend] Computing extent of low resolution
Extracting areas...
Writing areas...
Building topology for vector map tmp_66763@PERMANENT...
Registering primitives...
Building areas...
Attaching islands...
Attaching centroids...
r.to.vect complete.
[r.mblend] Computing extent of high resolution
Extracting areas...
Writing areas...
Building topology for vector map tmp_66764@PERMANENT...
Registering primitives...
Building areas...
Attaching islands...
Attaching centroids...
r.to.vect complete.
[r.mblend] Computing area to interpolate
Copying vector features from tmp_66763@PERMANENT...
Copying vector features from tmp_66764@PERMANENT...
Snapping boundaries with 1e-008 ...
Breaking lines...
Removing duplicates...
Cleaning boundaries at nodes...
Merging lines...
Attaching islands...
Building areas...
Attaching islands...
Querying vector map tmp_66763@PERMANENT...
Querying vector map tmp_66764@PERMANENT...
Writing centroids...
Copying results to final output map...
Building topology for vector map tmp_66765@PERMANENT...
Registering primitives...
Building areas...
Attaching islands...
Attaching centroids...
v.overlay complete.
[r.mblend] Computing buffer around interpolation area
Buffering areas...
Cleaning buffers...
Building parts of topology...
Building topology for vector map tmp_66766@PERMANENT...
Registering primitives...
Snapping boundaries...
Reading features...
Snap vertices Pass 1: select points
Snap vertices Pass 2: assign anchor vertices
Snap vertices Pass 3: snap to assigned points
Breaking polygons...
Breaking polygons (pass 1: select break points)...
Breaking polygons (pass 2: break at selected points)...
Removing duplicates...
Breaking boundaries...
Removing duplicates...
Cleaning boundaries at nodes
Building topology for vector map tmp_66766@PERMANENT...
Building areas...
Removing dangles...
Removing bridges...
Attaching islands...
Building topology for vector map tmp_66766@PERMANENT...
Attaching islands...
Calculating centroids for all areas...
Generating list of boundaries to be deleted...
Deleting boundaries...
Calculating centroids for areas...
Building topology for vector map tmp_66766@PERMANENT...
Registering primitives...
Building areas...
Attaching islands...
Attaching centroids...
[r.mblend] Vectorising differences between input rasters
Reading areas...
Writing raster map...
Reading areas...
Writing raster map...
All subsequent raster operations will be limited to the MASK area. Removing or renaming raster map named 'MASK' will restore raster operations to normal.
Extracting points...
Building topology for vector map tmp_66768@PERMANENT...
Registering primitives...
GRASS_INFO_PROGRESS: 10000
r.to.vect complete.
Raster MASK removed
[r.mblend] Computing distance to high resolution raster
Reading raster map <HIGH_DEM>...
Writing output raster maps...
[r.mblend] Rescaling distance to [0,10000] interval
Rescale tmp_66769[0,17214] to tmp_667610[0,10000]
[r.mblend] Extract points from interpolation area boundary
Building topology for vector map tmp_667612@PERMANENT...
Registering primitives...
v.to.points complete. 272 points written to output vector map.
[r.mblend] Copying features to layer 1
WARNING: Database connection and attribute tables for concerned layers are not changed
Processing features...
Copying attribute table(s)...
Building topology for vector map tmp_667611@PERMANENT...
Registering primitives...
v.category complete. 272 features modified.
[r.mblend] Linking attribute table to layer 1
The table <tmp_667611> is now part of vector map <tmp_667611> and may be deleted or overwritten by GRASS modules
Select privileges were granted on the table
[r.mblend] Querying distances raster
Column not found in the table <tmp_667611>. Creating...
Reading features from vector map...
Update vector attributes...
v.what.rast complete. 272 records updated.
[r.mblend] Selecting far edge points (using cut-off percentage)
Extracting features...
Building topology for vector map tmp_667616@PERMANENT...
Registering primitives...
Writing attributes...
[r.mblend] Dropping extra column from far edge
ERROR: Database connection not defined for layer 1
Region:
{'projection': 1, 'zone': 10, 'n': 5832954.11167627, 's': 5810106.61167627, 'w': 583264.36015974, 'e': 612324.2491979, 'nsres': 2.5, 'ewres': 2.49999045, 'rows': 9139, 'cols': 11624, 'cells': 106231736}
WARNING: No data base element files found
WARNING: No data base element files found
WARNING: No data base element files found
WARNING: No data base element files found
WARNING: Table <tmp_667611> linked to vector map <tmp_667611> does not exist
Traceback (most recent call last):
File "C:\Users\Uthra\AppData\Roaming\GRASS7\addons/scripts
/r.mblend.py", line 282, in
main()
File "C:\Users\Uthra\AppData\Roaming\GRASS7\addons/scripts
/r.mblend.py", line 241, in main
columns='along')
File "C:\PROGRA1\QGIS31.16\apps\grass\grass78\etc\python
\grass\script\core.py", line 441, in run_command
return handle_errors(returncode, returncode, args,
kwargs)
File "C:\PROGRA1\QGIS31.16\apps\grass\grass78\etc\python
\grass\script\core.py", line 343, in handle_errors
returncode=returncode)
grass.exceptions.CalledModuleError: Module run None
v.db.dropcolumn map=tmp_667616 layer=1 columns=along ended
with error
Process ended with non-zero return code 1. See errors in the
(error) output.
(Mon Dec 14 14:38:29 2020) Command finished (41 sec)