windows - ssi an error occurred while processing this directive -

i following error in shtml files

[an error occurred while processing directive] 

this error not happen when including file, happens when if expressions like:

<!--#if expr="$query_string = open-updates" --> open<!--#endif --> 

i running dev environment on windows machine using xampp

turns out had put following directive in httpd.conf

ssilegacyexprparser on 

the shtml files using came legacy apache server (1.x)