my PHP website 500 server error?

hi guys,

please help me I keep facing this error:

500 Server Error

A misconfiguration on the server caused a hiccup. Check the server logs, fix the problem, then try again.

here's the detail of the story :

I used a subdomain of my domain for uploading file.

I make a PHP page to upload my file.

I have edited the PHP.ini to allow a very big file to be uploaded, very big post value, max time, max input time, set the memory to 256M.

max_execution_time = 216000

max_input_time = 216000

memory_limit = 256M

post_max_size = 10000M

upload_max_filesize = 10000M

but still...

when I upload the file, it did reach 100% but it keep showing the error, and the file never uploaded.

it works when I uploaded small sized file though

thank you.