@HamishGBrown we typically see this issue when the outputs of a parent job changed but that child job’s inputs were not re-connected correctly.
Could you please try the following?
- Post a screenshot of the Inputs and Parameters tab of the failed Class 2D job (including passthrough params)
- Create a new job with the same parameters as the failed job (i.e., do not clone)
- Connect the J79 particles as inputs job as before
- Post another screenshot of the Inputs and Parameters tab for this new job.
- Run the job
If you still get the same error, the discrepancy may be further up the tree (e.g., J50 or higher)