[Answered ]-Internal Server Error on Django after I changed database

I finally managed to solve this. The problem was caused by the fact I had the wrong version of WSGI. In order to use WSGI with Python 3.4 mod_WSGI 4.2+ is required.

(I still don’t know why the problem began when I erased the db.sqlite3 file.)

See this for more details. I follow samb‘s step-by-step guide and it worked for me.