Added some skins with Npherno tool and Quake 2 modeler, Quark modeler problems

[Roarkes]

Hi. I"m Roarkes from moddb and Roarke from Quark forum.
I added some skins for Quake 2 with Npherno tool and renamed the skins path in Quark modeler to for example "models/thing/thing.pcx", like in the pak0.pak file and after that, running the qrk map, the model can be heard, but it is invisible.
After that, i tried with Quake 2 modeler with a backup model and renamed the skins path in Quark modeler to for example "models/thing/thing.pcx", like in the pak0 pak, running the qrk map, the model can be heard and seen, but i get the error in the Quake 2 console :
R_CullAliasModel models/thing/thing.md2: no such oldframe 52
R_CullAliasModel models/thing/thing.md2: no such frame 53

And this goes for many frames and than, when i hit the entity, it freezes, but i can still move around and move trough the entity like in the noclip mode.