If you want to just get in running somehow and you are on a linux system(ubuntu 14.04 in this case), you can run the following commands:
sudo a2dismod mpm_event
sudo a2enmod mpm_prefork
The above two commands are basically disabling the event module and instead using the prefork module.
For systems other than linux you can see for references on how to enable disable modules and just enable/disable the mentioned modules.
Note: I don't know what can be the performance or other implications of such a change. The above solution is derived from here