Error in "Particle Tracing for Fluid Flows": Duplicate function name

Hi
I am simulating "Particle Tracing" in a Microfluidic mixer. It has 5 Inlets and one outlet. When "Particle Tracing for Fluid Flow" number 2 and 4 are enabled together it generates this error:

Duplicate function name.
- Name: env_pgeom_fpt
Error in multiphysics compilation.

I tried to find this function in the model but I did not find this name anywhere in the model.
Please help me to figure it out. The model is attached.
Thanks