Error message

• Notice: unserialize(): Error at offset 0 of 4 bytes in filter_list_format() (line 679 of /home/auntleec/public_html/drupal/modules/filter/filter.module).
• Warning: unlink(./sites/default/files/.htaccess): No such file or directory in eval() (line 1 of /home/auntleec/public_html/drupal/modules/php/php.module(74) : eval()'d code).