php_warn

some of my web pages having the following issue when i call them
Warning:main(main_page.html.php): failed to open stream: No such file
or directory in /www/htdocs/web/public/public.php on line 50
Warning:main(): Failed opening 'main_page.html.php' for inclusion
(include_path='.:/usr/local/lib/php') in
/www/htdocs/web/public/public.php on line50



PHP Core shows the following

Directive => Local Value => Master Value
allow_call_time_pass_reference => Off => Off
disable_classes => no value => no value
disable_functions => exec, shell_exec, system, passthru,popen,
virtual, show_source,  pclose ,ftp_connect,mysql_list_tables,
display_errors => Off => Off
display_startup_errors => Off => Off
doc_root => no value => no value
docref_ext => no value => no value
docref_root => no value => no value
enable_dl => On => On
error_append_string => no value => no value
error_log => no value => no value
error_prepend_string => no value => no value
error_reporting => no value => no value
expose_php => On => On
extension_dir => ./ => ./
file_uploads => On => On
gpc_order => GPC => GPC
html_errors => Off => On
include_path => .:/usr/local/lib/php => .:/usr/local/lib/php
log_errors => On => On
log_errors_max_len => 1024 => 1024
magic_quotes_gpc => On => On
magic_quotes_runtime => Off => Off
magic_quotes_sybase => Off => Off
max_execution_time => 0 => 240
implicit_flush => On => Off
include_path => .:/usr/local/lib/php => .:/usr/local/lib/php
log_errors => On => On

any help how to resolve this issue.
Thanks