Saved project is there, but files won’t show up????

ive been editting my video, saving it regularly because i've been warned this program is known to crash. anyway, it did crash, so i re opened it as normal, however it is telling me to 'click here to add videos and photos' as if i was starting a new project, but it says down the bottom 'item 1 of 176' which is how many clips i had before i saved it, and it shows the length of my video as well, so the files must be there but why cant i see them to continue editing? i clicked add photos and videos like it says and nothing happens? why are my files invisible? also i havent moved the files or copied them anywhere, they are in the same spot where they were first saved and inserted in.