can't access theme options anymore

Until this morning I was able to get to the theme options with no problem. Today I just get a white screen with Done status. I checked the error log and found this:

[30-Apr-2009 02:28:52] WordPress database error Can't find file: '' (errno: 2) for query SELECT t.*, tt.* FROM wp_terms AS t INNER JOIN wp_term_taxonomy AS tt ON tt.term_id = t.term_id INNER JOIN wp_term_relationships AS tr ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE tt.taxonomy IN ('post_tag') AND tr.object_id IN (164) ORDER BY t.name ASC made by require, require_once, include, get_header, locate_template, load_template, require_once, dynamic_sidebar, call_user_func_array, stc_widget, wp_get_post_tags, wp_get_object_terms

I restored my WP files and WP DB to a day ago hoping that would fix the problem but I still get the same error. Please help.