iSolve failed in pig simulation.

I am simulating simulatenous acoustic pressure and temperature in a pig anatomical model with a SEFT using Sim4life light student edition. Everything appears good, but when I run the acoustic simulation I get an error message that iSolve failed because of invalid map<K, T> key. I cannot find information about this. How can I fix?

3fcfc57e-0a9c-4279-b4df-62efd2387197-image.png

345cc1aa-b097-44bb-9e11-41012a9854c1-image.png

Hi,

this typically happens if some material that is voxeled is not found. If I had to guess, I'd say that you have a source and no corresponding material (the source element should be in the Sources and Materials)