Cant run minecraft anymore

Name: 1.8.json
URL: https://launchermeta.mojang.com/mc/assets/1.8/e264980ad255aad2174cbe4d674c102474ae5202/1.8.json
Error details: Attempting to move successful download to C:/Users******\AppData\Roaming\.minecraft\assets\indexes/1.8.json The process cannot access the file because it is being used by another process
Filename on disk: 0593-b5de-8c1b-c810
Path: C:\Users******\AppData\Local\Temp\0593-b5de-8c1b-c810
Exists: file