here is the apache error log ,
[Tue Oct 09 13:16:03.968755 2018] [mpm_event:notice] [pid 2288:tid 139651209209728] AH00489: Apache/2.4.7 (Ubuntu) configured -- resuming normal operations
[Tue Oct 09 13:16:03.968846 2018] [core:notice] [pid 2288:tid 139651209209728] AH00094: Command line: '/usr/sbin/apache2'
[Tue Oct 09 13:16:53.191534 2018] [mpm_event:notice] [pid 2288:tid 139651209209728] AH00491: caught SIGTERM, shutting down
[Tue Oct 09 13:16:54.252450 2018] [mpm_prefork:notice] [pid 5317] AH00163: Apache/2.4.7 (Ubuntu) configured -- resuming normal operations
[Tue Oct 09 13:16:54.252542 2018] [core:notice] [pid 5317] AH00094: Command line: '/usr/sbin/apache2'
[Tue Oct 09 13:16:55.475431 2018] [mpm_prefork:notice] [pid 5317] AH00169: caught SIGTERM, shutting down
[Tue Oct 09 13:16:56.563387 2018] [mpm_prefork:notice] [pid 5403] AH00163: Apache/2.4.7 (Ubuntu) PHP/5.5.9-1ubuntu4.26 configured -- resuming normal operations
[Tue Oct 09 13:16:56.563438 2018] [core:notice] [pid 5403] AH00094: Command line: '/usr/sbin/apache2'
[Tue Oct 09 13:17:12.467766 2018] [mpm_prefork:notice] [pid 5403] AH00169: caught SIGTERM, shutting down
[Tue Oct 09 13:17:13.484370 2018] [mpm_prefork:notice] [pid 6517] AH00163: Apache/2.4.7 (Ubuntu) PHP/5.5.9-1ubuntu4.26 configured -- resuming normal operations
[Tue Oct 09 13:17:13.484427 2018] [core:notice] [pid 6517] AH00094: Command line: '/usr/sbin/apache2'
[Tue Oct 09 13:27:34.180844 2018] [:error] [pid 6522] [client 45.32.107.181:50226] PHP Warning: require(vendor/autoload.php): failed to open stream: No such file or directory in /var/www/html/index.php on line 12
[Tue Oct 09 13:27:34.180881 2018] [:error] [pid 6522] [client 45.32.107.181:50226] PHP Fatal error: require(): Failed opening required 'vendor/autoload.php' (include_path='.:/usr/share/php:/usr/share/pear') in /var/www/html/index.php on line 12
[Tue Oct 09 13:32:32.619401 2018] [:error] [pid 6529] [client 45.63.29.207:53760] PHP Warning: require(vendor/autoload.php): failed to open stream: No such file or directory in /var/www/html/index.php on line 12
[Tue Oct 09 13:32:32.619451 2018] [:error] [pid 6529] [client 45.63.29.207:53760] PHP Fatal error: require(): Failed opening required 'vendor/autoload.php' (include_path='.:/usr/share/php:/usr/share/pear') in /var/www/html/index.php on line 12
[Tue Oct 09 14:11:14.603224 2018] [:error] [pid 6521] [client 112.134.49.8:34153] PHP Warning: require(vendor/autoload.php): failed to open stream: No such file or directory in /var/www/html/index.php on line 12
[Tue Oct 09 14:11:14.603819 2018] [:error] [pid 6521] [client 112.134.49.8:34153] PHP Fatal error: require(): Failed opening required 'vendor/autoload.php' (include_path='.:/usr/share/php:/usr/share/pear') in /var/www/html/index.php on line 12
[Tue Oct 09 14:17:16.096870 2018] [:error] [pid 6529] [client 45.32.107.181:40182] PHP Warning: require(vendor/autoload.php): failed to open stream: No such file or directory in /var/www/html/index.php on line 12
[Tue Oct 09 14:17:16.096912 2018] [:error] [pid 6529] [client 45.32.107.181:40182] PHP Fatal error: require(): Failed opening required 'vendor/autoload.php' (include_path='.:/usr/share/php:/usr/share/pear') in /var/www/html/index.php on line 12
[Tue Oct 09 14:25:49.928455 2018] [mpm_prefork:notice] [pid 6517] AH00169: caught SIGTERM, shutting down
[Tue Oct 09 14:25:50.970996 2018] [mpm_prefork:notice] [pid 8486] AH00163: Apache/2.4.7 (Ubuntu) PHP/5.5.9-1ubuntu4.26 configured -- resuming normal operations
[Tue Oct 09 14:25:50.971051 2018] [core:notice] [pid 8486] AH00094: Command line: '/usr/sbin/apache2'
[Tue Oct 09 14:28:05.043075 2018] [mpm_prefork:notice] [pid 8486] AH00169: caught SIGTERM, shutting down
[Tue Oct 09 14:28:06.129510 2018] [mpm_prefork:notice] [pid 9137] AH00163: Apache/2.4.7 (Ubuntu) PHP/5.5.9-1ubuntu4.26 configured -- resuming normal operations
[Tue Oct 09 14:28:06.129565 2018] [core:notice] [pid 9137] AH00094: Command line: '/usr/sbin/apache2'
[Tue Oct 09 15:07:49.726506 2018] [mpm_prefork:notice] [pid 9137] AH00171: Graceful restart requested, doing restart
[Tue Oct 09 15:07:49.802590 2018] [mpm_prefork:notice] [pid 9137] AH00163: Apache/2.4.7 (Ubuntu) PHP/5.5.9-1ubuntu4.26 configured -- resuming normal operations
[Tue Oct 09 15:07:49.802609 2018] [core:notice] [pid 9137] AH00094: Command line: '/usr/sbin/apache2'
[Tue Oct 09 15:10:12.539176 2018] [mpm_prefork:notice] [pid 9137] AH00169: caught SIGTERM, shutting down
[Tue Oct 09 15:10:13.610451 2018] [mpm_prefork:notice] [pid 10849] AH00163: Apache/2.4.7 (Ubuntu) PHP/5.5.9-1ubuntu4.26 configured -- resuming normal operations
[Tue Oct 09 15:10:13.610516 2018] [core:notice] [pid 10849] AH00094: Command line: '/usr/sbin/apache2'
[Tue Oct 09 15:14:19.157756 2018] [mpm_prefork:notice] [pid 10849] AH00171: Graceful restart requested, doing restart
[Tue Oct 09 15:14:19.276732 2018] [mpm_prefork:notice] [pid 10849] AH00163: Apache/2.4.7 (Ubuntu) PHP/5.5.9-1ubuntu4.26 configured -- resuming normal operations
[Tue Oct 09 15:14:19.276745 2018] [core:notice] [pid 10849] AH00094: Command line: '/usr/sbin/apache2'
[Tue Oct 09 15:14:19.344358 2018] [mpm_prefork:notice] [pid 10849] AH00171: Graceful restart requested, doing restart
[Tue Oct 09 15:14:19.460702 2018] [mpm_prefork:notice] [pid 10849] AH00163: Apache/2.4.7 (Ubuntu) PHP/5.5.9-1ubuntu4.26 configured -- resuming normal operations
[Tue Oct 09 15:14:19.460718 2018] [core:notice] [pid 10849] AH00094: Command line: '/usr/sbin/apache2'
[Tue Oct 09 15:14:26.115547 2018] [mpm_prefork:notice] [pid 10849] AH00169: caught SIGTERM, shutting down
[Tue Oct 09 15:14:27.192389 2018] [mpm_prefork:notice] [pid 11995] AH00163: Apache/2.4.7 (Ubuntu) PHP/5.5.9-1ubuntu4.26 configured -- resuming normal operations
[Tue Oct 09 15:14:27.192447 2018] [core:notice] [pid 11995] AH00094: Command line: '/usr/sbin/apache2'
[Tue Oct 09 15:28:08.808911 2018] [mpm_prefork:notice] [pid 11995] AH00169: caught SIGTERM, shutting down
[Tue Oct 09 15:28:09.804243 2018] [mpm_prefork:notice] [pid 12181] AH00163: Apache/2.4.7 (Ubuntu) PHP/5.5.9-1ubuntu4.26 configured -- resuming normal operations
[Tue Oct 09 15:28:09.804299 2018] [core:notice] [pid 12181] AH00094: Command line: '/usr/sbin/apache2'
[Tue Oct 09 15:31:41.642784 2018] [mpm_prefork:notice] [pid 12181] AH00169: caught SIGTERM, shutting down
[Tue Oct 09 15:31:42.708047 2018] [mpm_prefork:notice] [pid 12249] AH00163: Apache/2.4.7 (Ubuntu) PHP/5.5.9-1ubuntu4.26 configured -- resuming normal operations
[Tue Oct 09 15:31:42.708105 2018] [core:notice] [pid 12249] AH00094: Command line: '/usr/sbin/apache2'
