File (.prel) unknown or codec doesn't exist ?

Hello,

I started to work with adobe premiere element 15 since december 2017. The last modification on my file (.prel) was the 8 st january 2018, but now, it's impossible to open and edit my file with the application and i don't understand why (even if i open it with the menu of adobe premiere element).

Can you help me on this please?

I hope i'm understood because i'm french and my english is not good....

Thank you,

Tiphaine