duplicate intry

i have this user waning in admin/build/themes

user warning: Duplicate entry 'themes/bluemarine/bluemarine.info' for key 1 query: INSERT INTO system (name, owner, info, type, filename, status, throttle, bootstrap) VALUES ('bluemarine', 'themes/engines/phptemplate/phptemplate.engine', 'a:13:{s:4:\"name\";s:10:\"Bluemarine\";s:11:\"description\";s:66:\"Table-based multi-column theme with a marine and ash color scheme.\";s:7:\"version\";s:4:\"6.10\";s:4:\"core\";s:3:\"6.x\";s:6:\"engine\";s:11:\"phptemplate\";s:7:\"project\";s:6:\"drupal\";s:9:\"datestamp\";s:10:\"1235596218\";s:7:\"regions\";a:5:{s:4:\"left\";s:12:\"Left sidebar\";s:5:\"right\";s:13:\"Right sidebar\";s:7:\"content\";s:7:\"Content\";s:6:\"header\";s:6:\"Header\";s:6:\"footer\";s:6:\"Footer\";}s:8:\"features\";a:10: in /home3/kenjimor/public_html/areatopic/modules/system/system.module on line 821.

appreciate suggestion.

best,