蒋海波

TypeError: can only concatenate tuple (not "NoneType") to tuple

1

Traceback (most recent call last): File "/Users/jianghaibo/Python/resource-ret-backend/manage.py", line 15, in execute_from_command_line(sys.argv) File "/Users/jianghaibo/.local/share/virtualenvs/resource-ret-backend-HZTWbhOI/lib/python3.6/site-packages/django/core/management/__init__.py", line 381, in execute_from_command_line utility.execute() File "/Users/jianghaibo/.local/share/virtualenvs/resource-ret-backend-HZTWbhOI/lib/python3.6/site-packages/django/core/management/__init__.py", line 375, in execute self.fetch_command(subcommand).run_from_argv(self.argv) File "/Users/jianghaibo/.local/share/virtualenvs/resource-ret-backend-HZTWbhOI/lib/python3.6/site-packages/django/core/management/__init__.py", line 224, in...