Error- "Too few initial conditions" equations

Hello!

I'm trying to solve some equations using command odesolve and all i get is error "too few initial conditions". After using ctrl+f9 it shows, that the problem is caused by constants K. I believe all "start" conditions are included. The document is about chemical reactions and i want to represent on a graph the change of the concentration of the elements in time. I'm using Mathcad 14.

Any ideas of what may be causing this problem?