wordpress error

i completed my client site in wordpress,then i uploaded this site into client server(FTP) but site is not going to open this error is occur " Warning: fopen(piecemakerXML.xm开发者_Go百科l) [function.fopen]: failed to open stream: Permission denied in F:\inetpub\vhosts\kni.com.my\httpdocs\wp-content\themes\twentyten\header.php on line 133 can't open file"

It's a file system permissions problem. WordPress does not have permission to access that file or the folder it's in. You'll have to change that. Most FTP programs have a CHMOD command built in, or you can shell in to the server, or use the hosting control panel.

Check the permissions of the file to ensure it is at least readable by the owner. And if you also want to write to it, it should be writable

Check out the page on Wordpress about file permissions. It has a pretty good list of example permissions
http://codex.wordpress.org/Changing_File_Permissions

Also Check out wikipedia

And to Change file permissions, do what @Dan said in his answer.