Trac cannot log in

Yesterday I upgrade my trac-accountmanager to 0.4.3 on my Debian laptop, then I cannot log in anymore.

The problem occurs due to configuration changing. Turn of debug log you will see

Trac[htfile] ERROR: acct_mgr: check_password() -- Can't locate password file ""

Just edit your trac.ini

from

htdigest_realm = your_realm
password_file = /path/to/htdigest
password_store = HtDigestStore

to

htdigest_realm =your_realm
htdigest_file = /path/to/htdigest
password_store = HtDigestStore