Your question regarding raster2pgsql has nothing to do with Django, so please 
ask questions related to that somewhere else (for instance 
onhttps://gis.stackexchange.com/ )

Regarding your first error, could you share the output of the following command 
on your command line:

gdalinfo --version

(just to check if you have gdal installed)

I agree that the above error message is not useful for users that want to use 
postgis but dont have gdal installed. Maybe its related to the gdal path or 
something else. GDAL should be installed as postgis itself already requires 
gdal.
http://postgis.net/docs/manual-2.3/postgis_installation.html#install_requirements



On Sunday, April 30, 2017 at 3:20:01 PM UTC+1, Prashant Verma wrote:
>
> C:\User\.........\Desktop\Geolocation>*python manage.py makemigrations*
> Traceback (most recent call last):
>   File 
> "C:\Users\Prashant\Desktop\Geolocation\casino_locater\lib\site-packages\django\db\utils.py",
>  
> line 115, in load_backend
>     return import_module('%s.base' % backend_name)
>   File 
> "C:\Users\Prashant\Desktop\Geolocation\casino_locater\lib\importlib\__init__.py",
>  
> line 126, in import_module
>     return _bootstrap._gcd_import(name[level:], package, level)
>   File "<frozen importlib._bootstrap>", line 978, in _gcd_import
>   File "<frozen importlib._bootstrap>", line 961, in _find_and_load
>   File "<frozen importlib._bootstrap>", line 950, in 
> _find_and_load_unlocked
>   File "<frozen importlib._bootstrap>", line 655, in _load_unlocked
>   File "<frozen importlib._bootstrap_external>", line 677, in exec_module
>   File "<frozen importlib._bootstrap>", line 205, in 
> _call_with_frames_removed
>   File 
> "C:\Users\Prashant\Desktop\Geolocation\casino_locater\lib\site-packages\django\contrib\gis\db\backends\postgis\base.py",
>  
> line 7, in <module>
>     from .operations import PostGISOperations
>   File 
> "C:\Users\Prashant\Desktop\Geolocation\casino_locater\lib\site-packages\django\contrib\gis\db\backends\postgis\operations.py",
>  
> line 7, in <module>
>     from django.contrib.gis.gdal import GDALRaster
> ImportError: cannot import name 'GDALRaster'
>
> During handling of the above exception, another exception occurred:
>
> Traceback (most recent call last):
>   File "manage.py", line 22, in <module>
>     execute_from_command_line(sys.argv)
>   File 
> "C:\Users\Prashant\Desktop\Geolocation\casino_locater\lib\site-packages\django\core\management\__init__.py",
>  
> line 363, in execute_from_command_line
>     utility.execute()
>   File 
> "C:\Users\Prashant\Desktop\Geolocation\casino_locater\lib\site-packages\django\core\management\__init__.py",
>  
> line 337, in execute
>     django.setup()
>   File 
> "C:\Users\Prashant\Desktop\Geolocation\casino_locater\lib\site-packages\django\__init__.py",
>  
> line 27, in setup
>     apps.populate(settings.INSTALLED_APPS)
>   File 
> "C:\Users\Prashant\Desktop\Geolocation\casino_locater\lib\site-packages\django\apps\registry.py",
>  
> line 108, in populate
>     app_config.import_models()
>   File 
> "C:\Users\Prashant\Desktop\Geolocation\casino_locater\lib\site-packages\django\apps\config.py",
>  
> line 202, in import_models
>     self.models_module = import_module(models_module_name)
>   File 
> "C:\Users\Prashant\Desktop\Geolocation\casino_locater\lib\importlib\__init__.py",
>  
> line 126, in import_module
>     return _bootstrap._gcd_import(name[level:], package, level)
>   File "<frozen importlib._bootstrap>", line 978, in _gcd_import
>   File "<frozen importlib._bootstrap>", line 961, in _find_and_load
>   File "<frozen importlib._bootstrap>", line 950, in 
> _find_and_load_unlocked
>   File "<frozen importlib._bootstrap>", line 655, in _load_unlocked
>   File "<frozen importlib._bootstrap_external>", line 677, in exec_module
>   File "<frozen importlib._bootstrap>", line 205, in 
> _call_with_frames_removed
>   File 
> "C:\Users\Prashant\Desktop\Geolocation\casino_locater\lib\site-packages\django\contrib\auth\models.py",
>  
> line 4, in <module>
>     from django.contrib.auth.base_user import AbstractBaseUser, 
> BaseUserManager
>   File 
> "C:\Users\Prashant\Desktop\Geolocation\casino_locater\lib\site-packages\django\contrib\auth\base_user.py",
>  
> line 52, in <module>
>     class AbstractBaseUser(models.Model):
>   File 
> "C:\Users\Prashant\Desktop\Geolocation\casino_locater\lib\site-packages\django\db\models\base.py",
>  
> line 124, in __new__
>     new_class.add_to_class('_meta', Options(meta, app_label))
>   File 
> "C:\Users\Prashant\Desktop\Geolocation\casino_locater\lib\site-packages\django\db\models\base.py",
>  
> line 330, in add_to_class
>     value.contribute_to_class(cls, name)
>   File 
> "C:\Users\Prashant\Desktop\Geolocation\casino_locater\lib\site-packages\django\db\models\options.py",
>  
> line 214, in contribute_to_class
>     self.db_table = truncate_name(self.db_table, 
> connection.ops.max_name_length())
>   File 
> "C:\Users\Prashant\Desktop\Geolocation\casino_locater\lib\site-packages\django\db\__init__.py",
>  
> line 33, in __getattr__
>     return getattr(connections[DEFAULT_DB_ALIAS], item)
>   File 
> "C:\Users\Prashant\Desktop\Geolocation\casino_locater\lib\site-packages\django\db\utils.py",
>  
> line 211, in __getitem__
>     backend = load_backend(db['ENGINE'])
>   File 
> "C:\Users\Prashant\Desktop\Geolocation\casino_locater\lib\site-packages\django\db\utils.py",
>  
> line 134, in load_backend
>     raise ImproperlyConfigured(error_msg)
> django.core.exceptions.ImproperlyConfigured: 
> 'django.contrib.gis.db.backends.postgis' isn't an available database 
> backend.
> Try using 'django.db.backends.XXX', where XXX is one of:
>     'mysql', 'oracle', 'postgresql', 'sqlite3'
> Error was: cannot import name 'GDALRaster'
>
>

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