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This may be a plugin or theme issue. Please attempt to disable all plugins, and use one of the default (Twenty*) themes. If the problem goes away, enable them one by one to identify the source of your troubles.

How can I disable a theme, as I am unable to get access to the dashboard

Rename the directory of your current active theme. If it’s “abc”, rename wp-content/themes/abc to wp-content/themes/abc-off. You can do this via FTP or from your hosting control panel.

working…. found a plugin that was stopping all.

what was the plugin that was causing the problem? I’m having trouble also.