Hi,
here is my log

tail -f /srv/www/htdocs/files/logs/projeqtor_20170314.log
2017-03-14 11:51:11.989 ** ERROR ** Strack trace :
2017-03-14 11:51:11.989 ** ERROR ** #0 Sql->query called at [/srv/www/htdocs/model/Parameter.php:1075]
2017-03-14 11:51:11.989 ** ERROR ** #1 Parameter->clearGlobalParameters called at [/srv/www/htdocs/db/maintenance.php:555]
2017-03-14 11:51:11.989 ** ERROR ** #2 include called at [/srv/www/htdocs/tool/loginCheck.php:57]
2017-03-14 11:51:11.989 ===== TRACE ===== =====================================
2017-03-14 11:51:11.989 ===== TRACE =====
2017-03-14 11:51:11.989 ===== TRACE ===== 2026 ERRORS DURING UPDATE TO VERSION V6.1.2
2017-03-14 11:51:11.989 ===== TRACE =====
2017-03-14 11:51:11.989 ===== TRACE ===== =====================================
2017-03-14 11:51:11.989 ===== TRACE =====

I can't login with admin/admin

My installation : SUSE SLES 12 SP2 apache2, Postgresql, php-5, Projeqtor 6.1.2.

I have the same but with Mysql and no problem.

Thank's