Problem involving "Failed to download file. af_za.json"

Name: af_za.json
URL: http://resources.download.minecraft.net/ae/aec135c1b9e7eb8d46ebe2081295583b4a449ac9
Error details: HTTP 403: Forbidden
Filename on disk: 21cd-27b8-a100-2070
Path: C:\Users\vincent\AppData\Local\Temp\21cd-27b8-a100-2070
Exists: file