iMovie Project Won't Open on the Same Computer

I had just finished a long project. I went to export it. iMovie told me that their wasn't enough memory and to close the program. THis happe when making my last project. I did so and reopened it and everythign was fine.

This time however when I reopened it the project was missing from my project libaray!

Thankfully when I searched for it in Finder it IS there. But when I click to open it. iMovie opens, but the Project doesn't, nor does it apear in my in-iMovie project libaray on the side bar (though it is there in Finder).

Please help!