Issue on first installation: no tables in Database - by: OlbiOne

Hi,
I'm trying to setup projeqtor, on an Ubuntu server.
Everything is running well until the ../projeqtor/view/main.php page , when I try to enter with the admin account, an error is rising.

the log tells :

2018-01-15 14:19:28.574 ***** ERROR ***** [] ERROR *****
2018-01-15 14:19:28.574 ***** ERROR ***** [] on file '/var/www/html/projeqtor/db/maintenance.php' at line (78)
2018-01-15 14:19:28.574 ***** ERROR ***** [] cause = fopen(../files/cron/MIGRATION): failed to open stream: Permission denied

the file ../files/cron/MIGRATION doesn't exist only "DEPLOY" in this folder

regards