Do you know what "Screen position out of view frustum Error" means? when attaching camera to an elevator...?

I attached a my FPC to a platform, the platform plays an animation made in unity. (one part has negative values it goes y=- 8 ), I call a menu(GUI) to select what floor and I freeze mouseLook, then on gui button I play the animation. Most of it works perfectly but when I use the animation that goes down to the negative values it throws this error. Do you know what it is and where to look to fix this error? Thanks

Screen position out of view frustum (screen pos 574.000000, 443.000000) (Camera rect 0 0 1045 1018) UnityEngine.Camera:ScreenPointToRay(Vector3) UnityEngine.Camera:ScreenPointToRay(Vector3) UnityEngine.SendMouseEvents:DoSendMouseEvents()

[....\Runtime\Camera\Camera.cpp line 1208]

frustrum ...???

It works now. The problem was, as I thought from the beginning, that I had negative values in my animation my lift was starting from y:0 going down to y:-8m and up to y:+16m. I think that some values of the the first person controller don't like to go negative when attached to an animated object.I just had to redo the animation starting from y:0 going up.