Hello.

First, sorry for my poor english.

In this mod when i am in the mysterious place and a monster called Guard come to attack me i got the following warning: "Scale parameters for Magic Effect Cure Poison are bad" and if i choose the "yes" option to Morrowing keep running and the monster cast a spell itself.

What means that warning?

If i choose "yes" when that warning appear can cause some negative effect in the game?

Thank you all!

Well, as you have seen it's a non-fatal error.

It often happens when a script calls ExplodeSpell on an activator that does not have a proper model with collision assigned to it.

Edit: just to be clear, you can just continue from the error without anything bad happening, except being bothered by that warning every once in a while.