Problem with heat flux

Hello, dear users.
I am trying to perform air flow simulations in a cooling tunnel  using OpenFOAM. The simulation works fine when the heating wall is defined as a constant temperature, but when I change the definition to heat flux, I get the following error.

Please give me some suggestions on how to solve this problem.

FEATool plug-in version: 1.17.5 Build 25.08.217
Matlab version: R2024b
OpenFOAM version: v2506
I am attaching the simulation file.
Thank you in advance for your assistance.

IRET_short_T.fea

Thank you for reporting the issue, this seems to be a problem specifically related to using the "heat flux" boundary conditions with OpenFoam. A fix for this should be available with the next release/update.