Please provide additional info. Which version, any other mods, etc.

version 1.16.5 i use fabric the mods i use are: pehkui,worldedit,immersive portals,chest cavity. i try to teleport to it it says entity not found, tried to go to the world spawn hes not there. maybe im doing something wrong i do /npc create name

The mixin target target warning doesn't mean anything (well at least mod is running).
Do commands give you any errors or do they output success message?

If you use the Taterzen name, it won't work when tping, you can however use /npc tp @p to tp the selected npc to you.
Is it Taterzen shown when running /npc list?

Also, are you running the latest version of Taterzens (0.4.0)? Do any logs show in console?

im using the latest version, nothing works ill just not use the mod :/ when i use /npc tp @p it just doesn't work. the log says this:
[main/WARN]: @mixin target net/minecraft/class_3898$class_3208 is public in taterzens.mixins.json:accessors.EntityTrackerEntryAccessor and should be specified in value

It's immersive portals causing them to not show up. I'll investigate further.

Humm, I guess it happens since Taterzens use some packet trickery which errors on the client. Might be resolved after I migrate it to disguiselib mod.

https://streamable.com/npj44w
i recorded what happens. the video is on singleplayer, multiplayer has the same outcome it doesn't work.
i think the problem is not about tping him but he just doesn't appear as a like player.