Hi! I have a big problem.
I follow step by step the file UPGRADE.TXT for upgrade mi old 5.1 version to the newest 6.2
I change the language to english (im spanish), and i deactivated all the modules
When i go to acces to the upgrade page (after upload the new files/folders and replace later "sites" and "files".
I dont modifi .htaccess or robots.txt
In settings.php i change FALSE to TRUE. The instalation works fine, but at the finish, i have this error:

Click in the link and appears this new page:

In wich we can view that at the left side, al the steps are in green...in fact, its seems that all have a good install less the forum.
Later, i have the real big problem, i cant acess to mi web for deacivate the maintenance mode::