whenever i go onto a Euka, just a Euka mod server, i get a CL_packetparseentities error and i have store bought copy. Remember its just Euka i have problems with.
It sounds like you might not have the latest build of Euka...though i'm not sure. So contact whoever gave you Euka and ask 'em.
Maybe noone gave it to him? He could get it from the same website i downloaded it.