ShopMeGood

I recently faced the same issue and the problem I diagnosed was the recent installed and activated plugin, if you can access your WordPress dashboard, then deactivate that particular plugin, if you cannot access your dashboard page at all, then you must remove the recent plugin entry from the database table wp_options, option name ‘active_plugins’ and then your WordPress dashboard page will be accessible. Hope that helps.

I would suggest the same as Marius did, if you can access your wordpress dashboard, then deactivate all and reactivate one by one, if you cannot access your dashboard page at all, then you must remove the recent plugin entry from the database table wp_options, option name ‘active_plugins’ and then your wordpress dashboard page will be accessible. Hope that helps.