Not possible to open Minecraft online: "Not possible to download the file. La_la.lang"

Not possible to open Minecraft online.
It requires to download the newest version of 1.12.2 (which I've already played) but an error occurs: Not possible to download the file. La_la.lang.

Details: Název: la_la.lang
URL: http://resources.download.minecraft.net/ad/ad13035a1ff2e9c2549858e1f11fb4a615a35bfb
Podrobnosti o chybě: Request error -101: ERR_CONNECTION_RESET
Název souboru na disku: ad13035a1ff2e9c2549858e1f11fb4a615a35bfb
Cesta: /Users/monikalarkin/Library/Application Support/minecraft/assets/objects/ad/ad13035a1ff2e9c2549858e1f11fb4a615a35bfb
Existuje: false

When trying to play offline, it returns me to the version 1.12.1. But my files were created in 1.12.2 — I've already played in this version.