There is little that can be done with this as it is just a corrupted project with missing graphics. There are no steps or procedure to show how this happened, so no way for Ashley to fix. For instance, what location was the project stored? Was it on a local HD, a memory stick, an online drive or something else?
Hopefully you have setup the automatic backups.
It is possible to open this project but you will need to re-add many of the missing graphics.
** EDIT **
As the missing graphics appeared to be just dummy collision sprites, I've redone them quickly. Your .capx now opens and runs without error.