Can't import models, and death trap?

[Reality]

Okay so basically when i right click >misc > model and import from xmodel file I get this error message:

FATAL ERROR: Can't find shader: shader_bin/vs_3_0_a1b5e1fa

GetLastError() = 3
An unrecoverable error has occurred. Would you like to edit preferences before exiting Q3Radiant?
and when i click either Yes or No it closed the program..

how can i fix this?

Also how can i make it so when someone walks somewhere they die?

sorry im a beginner mapper
thanks

[steveuk]

im not 100% sure, but i think the kill Trigger might do it.??? on radiant load game, press textures, and select tools, then select the kill trigger? i be trying that on my map soon, will let you know if it works