我不能运行我的系统，因为有一个错误的用户。ListTile Text（plant.name）中也有错误。参数类型“String？“”不能分配给参数类型“String”。有人能帮帮我吗

The argument type 'List<Plants>?' can't be assigned to the parameter type 'List<Plants>'.dartargument_type_not_assignable List<Plants>? users

body: FutureBuilder<List<Plants>>(
      future: PlantsApi.getPlantsLocally(context),
      builder:(context, snapshot) {
        final users = snapshot.data;
        switch (snapshot.connectionState) {
          case ConnectionState.waiting:
            return Center(child: CircularProgressIndicator());
          default:
          if (snapshot.hasError) {
            return Center(child: Text('Some error'),);
          }
          else {
            return buildPlants(users);
          }
        }
      }, 

Widget buildPlants(List<Plants> plants) => 
ListView.builder(
  
  itemCount: plants.length,
  itemBuilder: (context, index) {
    final plant = plants[index];
    return 
    
    ListTile (
      title: Text(plant.name),
    );
  }
  );

我的获取API

class PlantsApi {
  static Future<List<Plants>> getPlantsLocally(BuildContext context) async {
    final assetBundle = DefaultAssetBundle.of(context);
    final data = await assetBundle.loadString('assets/plants.json');
    final body = json.decode(data);

    return body.map<Plants>((e) => Plants.fromJson(e)).toList();
  }
}

这是json using data类的示例

[
        {
            "id": 1,
            "name": "ALOCASIA-ELEPHANT EARS",
            "image": "assets/images/ALOCASIA.jpeg",
            "descript": "Alocasia plant (Alocasia mortfontanensis) is a hybrid species between Alocasia longiloba and Alocasia sanderiana. The Alocasia is known for its large leaves and wide variety of cultivars within the species. Alocasia plant is native to tropical Asia and Australia.",
            "charac": [{
              "planttype": "Herb",
              "lifespan": "Perennial",
              "bloomtime": "Spring, summer",
              "plantheight": "1-2 feet",
              "spread": "7 feet",
              "leafColor": "PurpleGreenGreySilver"
            }
        ],
            "scienclass": [
                {
                "genus": "Alocasia - Elephant's-ears, Taro, Kris plant",
                "family": " Araceae - Arum, Aroids ",
                "order": "Alismatales - Water plantains and allies",
                "classes": "Liliopsida - Monocotyledons, Monocots ",
                "phylum":"Tracheophyta - Vascular plants, Seed plants, Ferns, Tracheophytes"
            }
        ],
            "pestdesease": " Stem rot, crown rot, root rot, leaf spot, mealy bugs, aphids",
            "requirements":[{
                "difficultyrating": "Alocasia plant is super easy to take care of, with resistance to almost all pests and diseases. It is a perfect option for gardeners with brown thumbs.",
                "sunlight": "Full shade to partial sun",
                "hardenesszone": " 9-11 ",
                "soil": "Loose, fertile and well-drained humus soil"
            }
        ],
            "careguide":[
                {
                "water": "Moisture-loving, keep the soil moist but do not let water accumulate.",
                "fertilizaton": "Fertilization once in spring. ", 
                "pruning": "Fertilization once in spring. ", 
                "plantingtime": "Spring, summer, autumn ",
                "propagation": "Division ",
                "pottingsuggestion": " Needs excellent drainage in pots."
            }
            ],
            "toxictohuman": "Is the alocasia plant poisonous for humans? The sap of alocasia plant is toxic to humans topically and when ingested. When the leaves are chewed or swallowed, symptoms may include swelling, stinging, and irritation of the mouth and gastrointestinal tract. In rare cases, it can cause swelling of the upper airway and difficulty breathing. Contact with the sap can also lead to skin irritation where the contact occurred. Poisoning is most likely to occur from accidental ingestion of the leaves or rough handling of the plant, particularly by children. Alocasia plant is often encountered as an ornamental plant in gardens or as a houseplant."
        },
        {
            "id": 2,
            "name": "Sample Sample",
            "image": "assets/images/ALOCASIA.jpeg",
            "descript": "Alocasia plant (Alocasia mortfontanensis) is a hybrid species between Alocasia longiloba and Alocasia sanderiana. The Alocasia is known for its large leaves and wide variety of cultivars within the species. Alocasia plant is native to tropical Asia and Australia.",
            "charac": [{
              "planttype": "Herb",
              "lifespan": "Perennial",
              "bloomtime": "Spring, summer",
              "plantheight": "1-2 feet",
              "spread": "7 feet",
              "leafColor": "PurpleGreenGreySilver"
            }
            ],
            "scienclass": [
                {
                "genus": "Alocasia - Elephant's-ears, Taro, Kris plant",
                "family": " Araceae - Arum, Aroids ",
                "order": "Alismatales - Water plantains and allies",
                "classes": "Liliopsida - Monocotyledons, Monocots ",
                "phylum":"Tracheophyta - Vascular plants, Seed plants, Ferns, Tracheophytes"
            }
            ],
            "pestdesease": " Stem rot, crown rot, root rot, leaf spot, mealy bugs, aphids",
            "requirements":[{
                "difficultyrating": "Alocasia plant is super easy to take care of, with resistance to almost all pests and diseases. It is a perfect option for gardeners with brown thumbs.",
                "sunlight": "Full shade to partial sun",
                "hardenesszone": " 9-11 ",
                "soil": "Loose, fertile and well-drained humus soil"
            }
            ],
            "careguide":[
                {
                "water": "Moisture-loving, keep the soil moist but do not let water accumulate.",
                "fertilizaton": "Fertilization once in spring. ", 
                "pruning": "Fertilization once in spring. ", 
                "plantingtime": "Spring, summer, autumn ",
                "propagation": "Division ",
                "pottingsuggestion": " Needs excellent drainage in pots."
            }
            ],
            "toxictohuman": "Is the alocasia plant poisonous for humans? The sap of alocasia plant is toxic to humans topically and when ingested. When the leaves are chewed or swallowed, symptoms may include swelling, stinging, and irritation of the mouth and gastrointestinal tract. In rare cases, it can cause swelling of the upper airway and difficulty breathing. Contact with the sap can also lead to skin irritation where the contact occurred. Poisoning is most likely to occur from accidental ingestion of the leaves or rough handling of the plant, particularly by children. Alocasia plant is often encountered as an ornamental plant in gardens or as a houseplant."
        }
    ]

我使用JSON的数据类将其转换为dart