[fix] cors urls

backend/project/config/settings.py

@@ -157,4 +157,5 @@ if DEBUG and not (TESTING or MIGRATING):
 
 CORS_ALLOWED_ORIGINS = [
     "http://158.160.56.239:8080",
+    "http://158.160.56.239:3000",
 ]

backend/project/teams/views.py

@@ -5,7 +5,7 @@ from rest_framework.views import APIView
 
 from teams.models import Team
 
-from .serializers import TeamSerializer
+from teams.serializers import TeamSerializer
 
 
 class AddUserToTeam(APIView):