Try:
– switching to the Twenty Eleven theme by renaming your current theme’s folder in wp-content/themes and adding “-old” to the end of the folder name using FTP or whatever file management application your host provides.
– resetting the plugins folder by FTP or phpMyAdmin.
– re-uploading all files & folders – except the wp-content folder – from a fresh download of WordPress.
thanx for ur reply……….i cant access sub folders ,cant access dashboard,nd the themes directory has just some empty text files….and i cant upload themestooo please help me
If you cannot access your site by FTP, you need to speak to your hosts.
we spoke ,they told that its the prob with wordpress……plz help us
No – they are wrong. WordPress cannot affect your FTP. Without that access, you cannot fix your site.
now i accessed ftp but cant change ,remove or rename folders
It’s a server issue – not a WordPress one. You need to speak to your hosts. You are paying them for this kind of support.