Thermal simulation with linear perfusion parameters

Dear all,

I'm trying to run transient thermal simulations in a human body model, with the use of perfusion parameters that are linear of piecewise linear with temperature. However, when I start running the simulations iSolve crashes instantly and reports the following error message:

ERROR: Simulation 'All 0 - Duke 4 tissues_even_hour_linear_perf - Copy' reports the following failure:
ERROR: Conformal information not available.

I am able to run the simulation with constant perfusion parameters, but once I go to linear or piecewise linear it crashes. How can I solve this issue?