Saltwater intrusion in 3D application

Hello, I am looking to apply the goswami-clement benchmark in a 3D format for a simulation of saltwater intrusion specific to my case. However, I am experiencing a recurring issue where the simulation crashes immediately when I attempt to run it. What would be the best way to resolve this? I would appreciate guidance on what factors I may have overlooked while transitioning from 2D to 3D and what steps I should take to address them. Please refer to the attached file. (6.9 MB)