What exactly? What version are you trying to open it with? This simply means that the project was created in a newer version of AE.
I'm trying to open it with After Effects CS6 but since its a school computer I don't know which excact version it is.
Hope this helped, but still waiting for the answer
After Effects CS6 is Version 11.X of After Effects released in 2012 and 13.X is After Effects CC 2014.X. So, if you want to open the CC 2014 project in CS6 then you need to follow the link provided by "Mylenium".
Apart from this you can check the below link for a workaround.