Check 1: Disable all plugin
There is 2 method to doing so:
- rename the plugin folder that located at wp-content/plugin.
- Disable WordPress Plugin from Database(PHPMyAdmin).
- Log into your PHPMyAdmin.
- Select the WordPress database.
- Browse to the wp_options table.
- Look for the active_plugins.
- Edit it and cut all of the value from option_value to a text editor(eg. NotePad) and backup it.
- Save it.