Check your .htaccess file. It looks like you're doing a 301 redirect from non-www to www, but you're missing a slash.
My guess is that yours looks like
Code:
RewriteRule (.*) http://www.programmerstalk.net$1 [R=301,L]
instead of
Code:
RewriteRule (.*) http://www.programmerstalk.net/$1 [R=301,L]