Error when removing status folder

[aurmil]

working on a linux server, everything is correctly set

http://centurion.aurelien.dev.mnstr.com/status/?removeMe=true gives

Warning: rmdir(.) [function.rmdir]: Invalid argument in .../centurion/library/Centurion/File/System.php on line 77

Warning: Cannot modify header information - headers already sent by (output started at .../centurion/library/Centurion/File/System.php:77) in .../centurion/public/status/index.php on line 11

index files are OK, status folder is empty but still exists