Cant run the game.

Put the summary of the bug you're having here

What I expected to happen was...:
I thought if I hit run then the game would star but it didnt

What actually happened was...:
the game said: Failed to download file. af_za.lang
Name: af_za.lang
URL: http://resources.download.minecraft.net/e7/e788d75e9e7b1cc1f4a429c3e300ef463b610746
Error details: Request error -105: ERR_NAME_NOT_RESOLVED
Filename on disk: e788d75e9e7b1cc1f4a429c3e300ef463b610746
Path: C:/Users\Gebruiker\AppData\Roaming\.minecraft\assets\objects\e7/e788d75e9e7b1cc1f4a429c3e300ef463b610746
Exists: false

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...
3. ...