forgotten imports

server_side/api/app.py

@@ -1,4 +1,4 @@
-from flask import Flask
+from flask import Flask, send_from_directory
 from flask_restful import Resource, Api
 
 from voting_system import voting_system

server_side/api/rating_system/rating_system.py

@@ -2,7 +2,7 @@ import os
 import json
 
 from flask import Flask, request
-from flask_restful import Resource, Api
+from flask_restful import Resource, Api, abort
 
 app = Flask(__name__)
 api = Api(app)