Runtime.ImportModuleError: Unable to import module 'vc__handler__python': No module named 'location_field'

Using Django Deployment
1

when i upload django project to vercel it gives me this error

i installed postgis and gdal libraries
this is my models

class Center(models.Model):
    name=models.CharField(max_length=64)
    government=models.ForeignKey(Government,on_delete=models.CASCADE)
    population=models.BigIntegerField(default=0)
    location = LocationField(based_fields=['city'], zoom=7, null=True, blank=True)
    def __str__(self):
        return f"{self.name}"

this is view.py

@api_view(["get"])
def get_centers(request):
   print("------------------centers---------------")
   # serializer=CenterSerializer(Center.objects.all(),many=True).data
   centers=Center.objects.annotate(
        schools_count=Count('school'),
        medical_facilities_count=Count('medical'),
        infrastructures_count=Count('infrastructure'),
        villages_count=Count('village'),
        holly_places_count=Count("holly_places"),
        public_safety_count=Count("public_safety"),
      )
   centers_data=[] 
   
   for center in centers:
      government=GovernmentSerializer(center.government).data
      centers_data.append({
         "name":center.name,
         "government":government,
          "villages":center.villages_count,
         "schools":center.schools_count,
         "medical_facilities":center.medical_facilities_count,
         "infrastructures:":center.infrastructures_count,
         "public_safety":center.public_safety_count,
         "population":center.population,
         "location":{center.location.x,center.location.y},
      })
   return Response(centers_data)

this is settings.py

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'poorest_villages',
    'rest_framework',
    'rest_framework.authtoken',
    'location_field.apps.DefaultConfig',
    'django.contrib.gis',
    'django.contrib.sites',
]
LOCATION_FIELD = {
 'map.provider': 'openstreetmap',
 'map.zoom': 15,
'search.provider': 'google',
 'search.suffix': '',
# # Google
 # ‘provider.google.api’: ‘//maps.google.com/maps/api/js?sensor=false’,
 # ‘provider.google.api_key’: ‘<INSERT GOOGLE API KEY>’,
 # ‘provider.google.api_libraries’: ‘’,
 # ‘provider.google.map.type’: ‘ROADMAP’,
# OpenStreetMap
 'provider.openstreetmap.max_zoom': 16,
}