Failed to initialize PROJ pipeline

[dazza-codes]

gdal2mbtiles.exceptions.CalledGdalError: Command '['gdalwarp', '-q', '-of', 'VRT', '-t_srs', 'EPSG:3857', '-r', 'bilinear', 'input.tif', '/vsistdout']' returned non-zero exit status 1.: proj_create: Error -38: failed to load datum shift file
ERROR 6: Failed to initialize PROJ pipeline from `+proj=utm +zone=4 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs' to `+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs': failed to load datum shift file

versions

$ cat /etc/lsb-release 
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=18.04
DISTRIB_CODENAME=bionic
DISTRIB_DESCRIPTION="Ubuntu 18.04.3 LTS"
$ python --version
Python 3.6.7
$ pip freeze | grep gdal
gdal2mbtiles==2.1.1
$ gdalinfo --version
GDAL 2.4.3, released 2019/10/28
$ proj --version
Rel. 6.1.1, July 1st, 2019

[elfmanryan]

Hi, this is probably too late to help, but i think you simply have a projection that is not recognised