没有一个名为“myapp”的模型，即使我在settings.py中添加了它

I'm getting the following error:

我得到以下错误:

ImportError at /
No module named midi_app
Request Method: GET
Request URL:    https://127.0.0.1:8000/
Django Version: 1.4.1
Exception Type: ImportError
Exception Value:    No module named midi_app
Exception Location: /Users/home/virtualenv/venv/lib/python2.7/site-packages/django/utils/importlib.py in import_module, line 35
Python Executable:  /Users/home/virtualenv/venv/bin/python
I