That looks like it's running then fails. One issue I've seen is the HDF (h5) format that Fluent uses can corrupt given the number of files written. In Fluent, under File>Preferences change I/O to Legacy. Unfortunately you lose adaption register definitions and it's less computationally efficient but it's more stable. Note, HDF is great for "normal" use, it's the many hundred case & data files that are written for the coupling that can cause a problem.