Error loading the site

Hello Everyone

today i try to change the URL of my local site , then the site wont open , and gave me this error

***Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator at postmaster@localhost to inform them of the time this error occurred, and the actions you performed just before this error.

More information about this error may be available in the server error log.

Additionally, a 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request.

Apache/2.4.3 (Win32) OpenSSL/1.0.1c PHP/5.4.7 Server at localhost Port 80***

please I need help