PHP runtime

Hello I have a problem with the PHP. I don't know what to do.

Warning: include(perch/runtime.php): failed to open stream: No such file or directory in /home4/aekeenan/public_html/windsoretontour.com/search.php on line 1

aekeenan@micromultinationalhk.com [~/public_html]# find -iname runtime.php ./windsoretontour.com/perch/core/apps/categories/runtime.php ./windsoretontour.com/perch/core/apps/content/runtime.php ./windsoretontour.com/perch/core/runtime/runtime.php

PHP Fatal error: Call to undefined function perch_get_css() in /home4/aekeenan/public_html/windsoretontour.com/example.php on line 6