the errors indicate that the code on th page is trying to include a file but that the file is missing.
Warning: Failed opening 'language/lang-.php' for inclusion (include_path='.;C:/phpdev/php/includes;C:/phpdev/php/class') in c:\phpdev\www\mainfile.php on line 166
so on mainfile.php the code is trying to include a file called language/lang-.php
language is a subdirectory and the actual file is lang-.php
check ure include paths to see if the file is present ie check to see if this file is present in a subfolder called language under the same directory as mainfile.php or in C:/phpdev/php/includes/language or C:/phpdev/php/class/language
reg
kevin