can not find the static files when use 'StaticFiles'

[ockan]

🐞 Bug Report

when use 'StaticFiles',as following the example code in docs:

app.register(StaticFiles(directory='static'), prefix="/static")

got

RuntimeError: Client disconnected before response was sent

INFO:     127.0.0.1:62593 - "GET /tabler/dist/js/tabler.min.js HTTP/1.1" 500 Internal Server Error
INFO:     127.0.0.1:62594 - "GET /dist/img/user.png HTTP/1.1" 500 Internal Server Error

change the statement to

app.register(StaticFiles(directory='static'), prefix="static")

got

INFO:     127.0.0.1:62653 - "GET /static/tabler/dist/js/tabler.min.js HTTP/1.1" 404 Not Found
INFO:     127.0.0.1:62653 - "GET /static/dist/img/user.png HTTP/1.1" 404 Not Found

when use 'StaticFilesHandler', all are OK

INFO:     127.0.0.1:62045 - "GET /static/base/bootstrap-table-1.24.0/dist/locale/bootstrap-table-zh-CN.min.js HTTP/1.1" 200 OK
INFO:     127.0.0.1:62044 - "GET /static/tabler/dist/js/tabler.min.js HTTP/1.1" 200 OK
INFO:     127.0.0.1:62044 - "GET /static/dist/img/user.png HTTP/1.1" 200 OK