Error while parsing base/campaigns/beta/description.json: File base/campaigns/beta/description.json not found (The system cannot find the path specified.)
https://imgur.com/hH2IlTX
<blockquote class="imgur-embed-pub" lang="en" data-id="a/rFTMn4Z" data-context="false" ><a href="//imgur.com/a/rFTMn4Z"></a></blockquote><script async src="//s.imgur.com/min/embed.js" charset="utf-8"></script>

This is not a mod bug, how is written in the Factorio documentation: "mods should not be able to crash the game", so we can't solve this.

Anyway, seems to me implied that mods (Krastorio 2 in particular) are not meant to be used with tutorial scenario.

One of Factorio dev tell me that it happens when people update to 0.18 and load a save file of the old campaign.
That's completely unrelated to Krastorio 2.