i need help

this is the message it gives me
Unable to save download. es_mx.lang
Name: es_mx.lang
URL: http://resources.download.minecraft.net/6d/6dcb4146ef950bc58eb3b3921df044d332a6b077
Error details: Attempting to move successful download to C:/Users\Damien kosi\AppData\Roaming\.minecraft\assets\objects\6d/6dcb4146ef950bc58eb3b3921df044d332a6b077
The process cannot access the file because it is being used by another process
Filename on disk: c145-d351-b336-ae44
Path: C:\Users\DAMIEN~1\AppData\Local\Temp\c145-d351-b336-ae44
Exists: file