How to solve Import “flask_cors” could not be resolved from source

from flask import Flask,request,jsonify
from flask_cors import CORS,cross_origin


app = Flask(__name__)
CORS(app)
app.config['ENV'] = "development"


@app.route('/auth',methods=["POST"])
@cross_origin()
def login():
    res=request.get_json()
    em=res["email"]
    pwd=res["password"]
    print(em+"\t"+pwd)
    return "success"

if __name__ == "__main__":
    app.run(debug=True)