cannot concatenate 'str' and 'list' objects

[Νικόλαος Κούρας]

in my case an .htaccess file gives redirects all html requests to /cgi-bin/counter.py by also provide as an argument to the counter.py script the initical html file request

RewriteEngine On
RewriteCond %{REQUEST_FILENAME} -f
RewriteRule ^/?(.+\.html) /cgi-bin/counter.py?page=$1 [L,PT,QSA]

so the latter you mentioned its not the case for me.
But iam wondering why this doesnt work on this server while on my previous host did.....