I have gone through logs which contain below information
[Wed Apr 11 15:58:16.019121 2018] [:error] [pid 12360:tid 1092] [client 10.0.8.185:55118] PHP Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; TLSmarty has a deprecated constructor in C:\Bitnami\testlink-1.9.16-7\apps\testlink\htdocs\lib\functions\tlsmarty.inc.php on line 110
[Wed Apr 11 15:58:16.405125 2018] [mpm_winnt:notice] [pid 6544:tid 460] AH00428: Parent: child process 12360 exited with status 3221225477 -- Restarting.
In above log, issue that you have mentioned is not an error.
But error in log is something else related to php.
Also i have tried solution as per link shared by you but it was not working.
Hope to get a better response.