Erro no filemtime

BOm, uso o filemtime na declaração de javascripts e css para que o mesmo seja atualizado sempre que alterado, porém quando abri o index.php deu o seguinte erro

Warning: filemtime() [function.filemtime]: stat failed for ../css/imagens/logo_icon_painel.ico in C:\Program Files\VertrigoServ\www\sisBGD\admin\index.php on line 52 Call Stack #TimeMemoryFunctionLocation 10.0143341960{main}( )..\index.php:0 20.3904478856filemtime ( )..\index.php:52 " type="image/x-icon" /> ( ! ) Warning: filemtime() [function.filemtime]: stat failed for ../css/imagens/logo_icon_painel.ico in C:\Program Files\VertrigoServ\www\sisBGD\admin\index.php on line 53 Call Stack #TimeMemoryFunctionLocation 10.0143341960{main}( )..\index.php:0 20.4366479080filemtime ( )..\index.php:53 " type="image/x-icon" />