HL2 "graph node out of date"

[Arthur]

Having trouble with this mod i downloaded for HL2 Minerva: Metastasis, when i start it up it comes up with the message "graph node out of date, rebuilding..." I didnt think anything of it until I got further into the level and Huge floating glowing red objects that read "ERROR" are all over the place, I'm assuming they're meant to be effects that the mod maker made, and theres also the same problem where i come across purple and black checkered squares all over the walls. I've searched all over the internet but all i get is people asking the same question but with no answers. Would be glad with any help. Cheers.

 

[Arthur]

I have, I just updated my drivers aswell as they were Beta beforehand but still no change... come across more problems like no sky and random bits of text appearing all over the place. God Bless Valve and their support.