Go to PREFIX_users in phpMyAdmin. Edit the first row (should be your user_id). Change the user_theme input (or whatever it is - something with theme in it) to "Default" without quotes. Save and it should work.
If you Put it as the default theme for the whole site, you'll have to edit (I think the table is) PREFIX_settings or PREFIX_sitesettings. You get the idea. Just do the same as above, and change the theme part to Default
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