In order to fix the issue, I suggest you download and install the latest version of Apache HTTP Server from the official web page. Once you download it, launch the installer and accept the license agreement. Fill up the server information fields with the name of the domain that the server will run (you can leave it blank if you run the server locally), the Fully Qualified Domain Name of the server, the administrator email address, type Typical Setup in the Setup Type field, select the destination directory and press Install. If you still have problems, you can use the contact information from Apache website to get in touch with the support team.