some of my posts gives me internal server error
Are they always the same posts? Can you provide an example.
no only in some of my posts T_T
How can an individual post give an error?? Do you mean there's an error when you go to certain threads??
yes
i given an error when you go to certain threads??
Is there anything similar about these threads?? Is there anything more in the server error log explaining what caused them??
What there's nothing in the error log whatsoever??
Whats your forum URL, do you have a .htaccess file? Have you asked your host about this?