What it is WATCHDOG_EXPIRED ?
It means that there is a problem with sentinel.
What is the result of ./monacoCoin-cli masternode status ?
Did you install sentinel ?
If yes, did you replace YOUR HOME DIRECTORY by your username in the sentinel.conf ? (edited)
If, yes, was the test : ./venv/bin/py.test ./test ok ?
If yes, did you replace YOURUSERNAME by your username in the crontab ?
If everything is ok,