I am building a chlorine decay model using MSX. When I tried to input the following equation to represent pipe wall decay in the "Term" tab, the "Error 513 - could not integrate reaction rate expressions" keep coming up. I am pretty sure it is to do with the "power" expression as the MSX model runs fine without it.

WALL= -4/D*KW/1000*CL^0.1

Has anyone experienced this before and how did you go about fixing this?