drf error, 'Expected a dictionary, but got QuerySet.'

I have a problem with drf function view, I am getting an serializer error like this: {'non_field_errors': [ErrorDetail(string='Invalid data. Expected a dictionary, but got QuerySet.', code='invalid')]} Here's my function based view:

@api_view(["GET","POST"])
def UserSearch(request):
    selected_users = Profile.objects.all()
    serializer = UserProfileSerializer(data=selected_users)
    if serializer.is_valid():
        return Response(data=serializer.data)
    else:
        return Response(serializer.errors,status=status.HTTP_400_BAD_REQUEST)

My serializer:

class UserProfileSerializer(serializers.ModelSerializer):
    class Meta:
        fields = ('user','name','surname','gender','country','city','sport')
        model = Profile

And Profile model:

class Profile(models.Model):
    user = models.OneToOneField(User,on_delete=models.CASCADE)

    name = models.CharField(max_length=50, blank=True)
    surname = models.CharField(max_length=50, blank=True)
    gender = models.CharField(max_length=50, blank=True)

    country = models.CharField(max_length=50, blank=True)
    city = models.CharField(max_length=50, blank=True)
    sport = models.CharField(max_length=60, blank=True)

    #date_of_birth = models.DateField()
    def __str__(self):
        return f"{self.name} {self.surname} from {self.city}"

your problem is here:

serializer = UserProfileSerializer(data=selected_users)

this must be

serializer = UserProfileSerializer(selected_users, many=True)

data= should not be present here, data is only for python dict, when you want to serialize a python dict for example.

why many=True, because you are querying more than 1 table rows, so it needs to be many

and your final code will be:

@api_view(["GET","POST"])
def UserSearch(request):
    selected_users = Profile.objects.all()
    serializer = UserProfileSerializer(selected_users, many=True) # <------
    if serializer.is_valid():
        return Response(data=serializer.data)

    # that else was redundant
    return Response(serializer.errors,status=status.HTTP_400_BAD_REQUEST)