Can't add exception?

So last night Avast put a file in my virus chest, when I press “restore” or “restore and add exception”, it says the file can’t be restored. Now a program doesn’t work anymore, what do I do?

Details might be helpful. What was put in the Virus Chest and what’s the program that no longer works?

Something called IDP.Generic, the program was ddlc.exe with a mod installed on it,

You can report it to Avast as a false positive.

Submitting files from the Virus Chest to Avast Virus Lab
https://www.avast.com/faq.php?article=AVKB21#idt_07

What do I do for now?