says it's unable to save download. en_ca.Lang

Unable to save download. en_ca.lang
Name: en_ca.lang
URL: http://resources.download.minecraft.net/ec/ec58382dba909d8c6463f64fdbe1524754c44306
Error details: Attempting to move successful download to C:/Users\bcrou\AppData\Roaming\.minecraft\assets\objects\ec/ec58382dba909d8c6463f64fdbe1524754c44306
The process cannot access the file because it is being used by another process
Filename on disk: b4c2-095b-bcd6-7c99
Path: C:\Users\bcrou\AppData\Local\Temp\b4c2-095b-bcd6-7c99
Exists: file