Internal Server Error


For the last 4 or 5 days (?) I get the following message whenever I try to “run” an html file that was working before:

Internal Server Error

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

Please contact the server administrator at [no address given] 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/2.4.7 (Ubuntu) Server at Port 443

EDIT: Now the server starts as normal but when I refresh the browser window I get this (starting on line 4)

Starting Apache httpd, serving
Started apache2
[Tue Sep 26 14:31:00.481991 2017] [mpm_prefork:notice] [pid 22082] AH00163: Apache/2.4.7 (Ubuntu) PHP/5.5.9-1ubuntu4.20 configured – resuming normal operations
[Tue Sep 26 14:31:00.482075 2017] [core:notice] [pid 22082] AH00094: Command line: ‘apache2’
[Tue Sep 26 14:31:04.461716 2017] [mpm_prefork:notice] [pid 22082] AH00169: caught SIGTERM, shutting down