NOT NULL constraint failed: myapi_information.owner_id

[M Adnan]

class InformationSerializer(serializers.ModelSerializer):

    owner=serializers.StringRelatedField(read_only=True)

    class Meta:

        model=Information

        fields=['id', 'owner', 'title', 'content', 'created_at']

class RegisterSerializer(serializers.ModelSerializer):

    class Meta:

        model = User

        fields = ('id','first_name', 'last_name','username', 'email', 'password')

        extra_kwargs = {'password': {'write_only': True}}

    def create(self, validated_data):

        user = User.objects.create_user(first_name=validated_data['first_name'],last_name=validated_data['last_name'],username=validated_data['username'], email=validated_data['email'], password=validated_data['password'])

        return user

in models owner is related to information using forignKey

can anyone help me solving this error?