When Apache or PHP encounter a problem, sometimes this message is displayed…
Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator at email@example.com 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.
Apache/2.4.9 (Win32) PHP/5.5.11 Server Port 80
This error is usually 99% of the time a result of an .htaccess file problem.
Check the specific website’s .htaccess file to make sure it’s not using old or incorrect paths and URLs, RewriteRules, nor a bad RewriteBase /path (try commenting it out with a #).
Also, a much more informative/helpful error message will be logged in the website’s HTTP and PHP error logs…
If you select this website in WampDeveloper’s Websites Tab, and click the (“Logs HTTP” group) ErrorLog and PhpLog buttons, the end of the files will tell what the real issue is. It might be something really easy to fix/correct.
If nothing relevant is shown, check the general Apache and PHP error logs files (in WampDeveloper’s Reliability Tab).