Warning messages when item is placed in map

[jstog]

Failed to load shader models/powerups/ammo/rockammo for models/powerups/ammo/rocetam.md3
Activate shader failed for models/powerups/ammo/skin.tga
Activate shader failed for models/powerups/health/yellow
Failed to load shader models/powerups/health/yellow for models/powerups/health/medium_cross.md3
Activate shader failed for models/powerups/health/skin.tga

These are the warnings that I receive in GtkRadiant 1.6.6 when the rocket, ammo, and health are placed in the map.

However, they show up fine when the map is compiled and running....