CalledModuleError: Module run None ['g.gisenv', '-n'] ended with error Process ended with non-zer return code -1073741701. See errors in the (error) output.

import os, sys, subprocess

# define GRASS database, location and mapset
gisdb = r'C:datagrass'
location = "Country"
mapset = "Solar"

# location of GRASS start script
grass7bin = r'C:Program FilesQGIS2.18bingrass72.bat'

# query GRASS GIS itself for its GISBASE
startcmd = [grass7bin, '--config', 'path']
try:
    p = subprocess.Popen(startcmd, shell=False,
                         stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    out, err = p.communicate()
except OSError as error:
    sys.exit("ERROR: Cannot find GRASS GIS start script"
             " {cmd}: {error}".format(cmd=startcmd[0], error=error))
if p.returncode != 0:
    sys.exit("ERROR: Issues running GRASS GIS start script"
             " {cmd}: {error}"
             .format(cmd=' '.join(startcmd), error=err))
gisbase = out.strip(os.linesep)

# set GISBASE environment variable
os.environ['GISBASE'] = gisbase
os.environ['GISDBASE'] = gisdb

# define GRASS-Python environment
grass_pydir = os.path.join(gisbase, "etc", "python")
sys.path.append(grass_pydir)

# import GRASS Python bindings
import grass.script as gscript
import grass.script.setup as gsetup

# launch session
rcfile = gsetup.init(gisbase, gisdb, location, mapset)

# example calls
gscript.message('Current GRASS GIS 7 environment:')
print gscript.gisenv()