The problem I have is that I get a pet down, which replaces the strider, it works perfectly. the pet reacts and follows the character, can be mounted. Only the problem is in the Lineagemonster.u file. What it asks me to replace with the original, what it does is that when I take out the Wyvern it crashes and doesn't move, as the photo shows, what I'm trying to do is edit that .u file ... But I can't Find a program to do it, I only have the viewer and I can only edit if I export in .uc format. Change line to original Wyvern, but can't change file. I don't know if I explained you well
Here are the images:
This is what the dragon looks like when I ride it:
This is the npcgrp file:
the program to see inside lineagemonster.u:
I can edit it by opening it with Sublime: