（响应本机）[未处理的承诺拒绝：TypeError：未定义不是对象（正在评估“ _context.t0.response.data”））

Question

当我尝试通过react native组件/屏幕中的按钮启动api调用时出现以下错误：

Unhandled promise rejection: TypeError: undefined is not an object (evaluating '_context.t0.response.data')]
 * src\screens\NTCPDiamondScreen.js:335:17 in Button.props.onPress
 * node_modules\regenerator-runtime\runtime.js:45:44 in tryCatch
 * node_modules\regenerator-runtime\runtime.js:274:30 in invoke
 * node_modules\regenerator-runtime\runtime.js:45:44 in tryCatch
 * node_modules\regenerator-runtime\runtime.js:135:28 in invoke
 * node_modules\regenerator-runtime\runtime.js:145:19 in PromiseImpl.resolve.then$argument_0
 * node_modules\promise\setimmediate\core.js:37:14 in tryCallOne
 * node_modules\promise\setimmediate\core.js:123:25 in setImmediate$argument_0
 * node_modules\react-native\Libraries\Core\Timers\JSTimers.js:146:14 in _callTimer
 * node_modules\react-native\Libraries\Core\Timers\JSTimers.js:194:17 in _callImmediatesPass
 * node_modules\react-native\Libraries\Core\Timers\JSTimers.js:458:30 in callImmediates
 * [native code]:null in callImmediates
 * node_modules\react-native\Libraries\BatchedBridge\MessageQueue.js:407:6 in __callImmediates
 * node_modules\react-native\Libraries\BatchedBridge\MessageQueue.js:143:6 in __guard$argument_0
 * node_modules\react-native\Libraries\BatchedBridge\MessageQueue.js:384:10 in __guard
 * node_modules\react-native\Libraries\BatchedBridge\MessageQueue.js:142:17 in __guard$argument_0
 * [native code]:null in flushedQueue
 * [native code]:null in callFunctionReturnFlushedQueue
 * node_modules\react-native\Libraries\BatchedBridge\MessageQueue.js:143:6 in __guard$argument_0
 * node_modules\react-native\Libraries\BatchedBridge\MessageQueue.js:384:10 in __guard
 * node_modules\react-native\Libraries\BatchedBridge\MessageQueue.js:142:17 in __guard$argument_0
 * [native code]:null in flushedQueue
 * [native code]:null in callFunctionReturnFlushedQueue

反应本机组件：

import React, { useRef, useState, useContext, useEffect } from "react";
import {
  Dimensions,
  PanResponder,
  View,
  StyleSheet,
  Text,
  Alert,
  AsyncStorage,
} from "react-native";


import diamondApi from "../api/diamondApi"; //file in which I have defined axios instance



const AComponentScreen = ({ navigation }) => {
  //Parameteres received from a previous screen
  const projectName = navigation.getParam("projectName");
  const projectDescription = navigation.getParam("projectDescription");
  const projectBudget = navigation.getParam("projectBudget");
  const projectDuration = navigation.getParam("projectDuration");
  const industry = navigation.getParam("industry");
  const companyName = navigation.getParam("companyName");
  const numberOfEmployees = navigation.getParam("numberOfEmployees");
  const diamond = navigation.getParam("diamond");
 
  const [projects, setProjects] = useState();

  

  
  return (
    <View
      style={{
        flex: 1,
        backgroundColor: "#fff",
      }}
    >
    

      

      <Button
        title="Save and Continue"
        onPress={async () => {
         // initiating api call here!
          try {
            const result = await diamondApi.post("/projects", {
              projectName,
              projectDescription,
              projectBudget,
              projectDuration,
              industry,
              companyName,
              numberOfEmployees,
              diamond,
            });
            setProjects(result.data);

           
          } catch (err) {
            console.log(err.response.data);
          }
          if (!projects) {
            console.log("loading...");
            return <Text>Loading...</Text>;
          } else {
            console.log("Got projects!");
            console.log(projects);
           

            navigation.navigate("AnotherScreen"); //navigate to some other screen
          }
        }}
        type="solid"
        buttonStyle={{
          backgroundColor: "#5CDD3F",
          marginHorizontal: 15,
          marginBottom: 10,
        }}
        titleStyle={{ fontFamily: "sans-serif-light" }}
      />
    </View>
  );
};

const styles = StyleSheet.create({
  container: {
    backgroundColor: "rgba(255,255,255,0.01)",
  },
});

NTCPDiamondScreen.navigationOptions = {
  title: "Create New Diamond",
};

export default AComponentScreen;

我的帖子请求：

router.post("/projects", async (req, res) => {
  const {
    projectName,
    projectDescription,
    projectBudget,
    projectDuration,
    industry,
    companyName,
    numberOfEmployees,
    diamond,
  } = req.body;
  console.log(diamond);

//diamond is an array having structure like this: diamond[ { criteria: {a: "A", b: "B", c:"C", d:"D"} } ]

  const [projectDiamond] = diamond;

  const { criteria } = projectDiamond;

  if (
    !projectName ||
    !projectDescription ||
    !projectBudget ||
    !projectDuration ||
    !industry ||
    !companyName ||
    !numberOfEmployees ||
    !diamond
  ) {
    return res.status(422).send({ error: "Must provide all project details" });
  }

  try {
    const project = new Project({
      projectName,
      projectDescription,
      projectBudget,
      projectDuration,
      industry,
      companyName,
      numberOfEmployees,
      diamond,
      userId: req.user._id,
    });

    const recommendation = await Recommendation.find({
      "diamond.criteria": criteria,
    }); 
    const projectsWithSameDiamond = await Project.find({
      "diamond.criteria": criteria,
    }); 
    
    const projectsWithSameIndustry = await Project.find({ industry });  
    
    console.log(res);
    
    

  res.json({
  project,
  projectsWithSameDiamond,
  projectsWithSameIndustry,
  recommendation,
});
  } catch (err) {
    res.status(422).send({ error: err.message });
  }
});

以及包含axios实例的文件（diamondApi.js）：

import axios from "axios";
import { AsyncStorage } from "react-native";
const instance = axios.create({
  baseURL: " http://b4e79d22cea5.ngrok.io", //using ngrok to connect to the backend in react native project
});

instance.interceptors.request.use(
  async (config) => {
    const token = await AsyncStorage.getItem("token");

    if (token) {
      config.headers.Authorization = `Bearer ${token}`;
    }
    return config;
  },
  (err) => {
    return Promise.reject(err);
  }
);

export default instance;

任何人都可以解释此错误的原因是什么？我想念什么或做错什么？以及如何解决？