flask使用报错 Error: While importing 'app', an ImportError was raised.

这是一个基于知识图谱的《红楼梦》人物关系可视化及问答系统，使用flask框架，但是为何报错？请问如何解决？望赐教，不胜感激。

使用的flask版本是2.2.0

from flask import Flask, render_template, request, jsonify
from neo_db.query_graph import query,get_KGQA_answer,get_answer_profile
from KGQA.ltp import get_target_array
import sys
app = Flask(__name__)


@app.route('/', methods=['GET', 'POST'])
@app.route('/index', methods=['GET', 'POST'])

def index(name=None):
    return render_template('index.html', name = name)


@app.route('/search', methods=['GET', 'POST'])
def search():
    return render_template('search.html')


@app.route('/KGQA', methods=['GET', 'POST'])
def KGQA():
    return render_template('KGQA.html')
@app.route('/get_profile',methods=['GET','POST'])
def get_profile():
    name = request.args.get('character_name')
    json_data = get_answer_profile(name)
    return jsonify(json_data)

@app.route('/KGQA_answer', methods=['GET', 'POST'])
def KGQA_answer():
    question = request.args.get('name')
    json_data = get_KGQA_answer(get_target_array(str(question)))
    return jsonify(json_data)
@app.route('/search_name', methods=['GET', 'POST'])
def search_name():
    name = request.args.get('name')
    json_data=query(str(name))
    return jsonify(json_data)

@app.route('/get_all_relation', methods=['GET', 'POST'])
def get_all_relation():
    return render_template('all_relation.html')

if __name__ == '__main__':
    # app.debug=True
    app.run(host='0.0.0.0', port='5000')

这个报错应该是循环引用了，一般是新手常见问题，在你引用的模块中应该有from app.py import app，解决方案是将关于app相关的放到第三个文件中处理（第三个文件不要引用到app,因为app.py会应用到这第三个文件）或者放到app.py中处理都可以