i'm getting a WATCHDOG_EXPIRED error for my mn..  here's the code:

kzcash@KZ-MN:~/sentinel$ ./venv/bin/python bin/sentinel.py
[error]: unable to open database file
Cannot connect to database. Please ensure database service is running and user access is properly configured in 'sentinel.conf'.
kzcash@KZ-MN:~/sentinel$


it was running just fine before this, so I know I set it up right from the tutorial.