Its saying the paras don't exist, thus they will not work if they're not listed in the paras.
I will chop it down.
It says: The "BlendTree" in the FX LAYER controller uses a parameter called "BODY SUIT SLEEVES HUE", but that para does not exist within the para settings thus is cannot be used. Causing this error.
The same thing for the second one, but its a different para. The para the second one is missing is called "wings tail hue".
How do you fix it? Find the para the model is using, set it as "Int, float, or bool" depending (I have no idea which one they would use) and type in the name EXACTLY as you see it in the error. Ex: BODYSUIT SLEEVES HUE and wings tail hue