[Koha] Upgrade to v.2.2.5

[Carol Ku]

I have Koha v.2.2.4 on Windows XP.
  I extracted the file using power Archive and copied and renamed the extracted folder koha-2.2.5 to koha225 under c:\usr\koha225, then I change my koha.conf as follows:
   
  database=<database_name>
hostname=localhost
user=koha
pass=koha
intranetdir=c:\usr\koha225\intranet-cgi
opacdir=c:\usr\koha225\opac-cgi
kohaversion=2.2.5
opachtdocs=c:\usr\koha225\opac-html\opac-tmpl
intrahtdocs=c:\usr\koha225\intranet-html\intranet-tmpl
includes=c:\usr\koha225\intranet-html\intranet-tmpl\npl\en\includes

But when i try to access koha, I encountered an error message:
  Premature end of script headers: mainpage.pl 
   
  Error 500.
   
  Did I miss anything?

		
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