I am not sure what's wrong with this error messages

[NGUYENDUCTRUONG]

Hello everyone, i need some help please. I search but no luck with the issues.

I was trying to AdminCP -> Update Counters -> Rebuild Post Cache

here's the error message:

Building Post Cache
Processing: 19 1, 2
Processing: 20 1, 2
Processing: 21 1, 2
Processing: 23 1, 2
Processing: 24 1, 2
Processing: 26 1, 2
Processing: 32 1, 2
Processing: 33 1, 2
Processing: 36 1, 2
Processing: 37 1, 2

Warning: file_get_contents(/home/path/public_html/forum/includes/database_error_message.html) [function.file-get-contents]: failed to open stream: No such file or directory in /includes/class_core.php on line 918

Warning: file_get_contents(/home/path/public_html/forum/includes/database_error_message.html) [function.file-get-contents]: failed to open stream: No such file or directory in /includes/class_core.php on line 944

I appreciate it alot for your help