Attempted to create unknown particle system type "blood_impact_green_01"!

I get this error in the console ONLY when I shoot antlions/antlion guards,along with several other particle errors. Similarly, I get
Attemped to precache unknown particle system “blood_impact_synth_01”! when shooting a hunter. This is in G-Mod only, but the effects work fine in HL2. What can I do to fix this?