Hi DrabOwl94 Looks like this is a bug. Strange no one found it until now. Anyway, you can just add a --params-override at the end of the command line and it should work (and --max-iteration-per-job <YOUR_INT> and --total-max-job <YOUR_INT> as Optuna requires this). We will fix this one in the next patch.
Also, could you please open a Github issue? It should contain your command line and this error.
Thank you