For the site to work a php file named only cw_modules/init.php must be found using an include path defined in the we server configuration.
That means that the include path must contain the folder in which cw_modules/ is found.
Current include paths:
.
/usr/share/php
cw_config/config.php
via include_path using stream_resolve_include_path()
...cw_modules/init.php
via include_path using stream_resolve_include_path()
...