Unclear error message when misconfigured forward model in config

What happened? (You can include a screenshot if it helps explain)

I tried running DESIGN2Params but it was unclear how to pass arguments to the forward model, so I tried passing them as positional arguments. This does not seem to be supported, but the error message was not helpful. FORWARD_MODEL DESIGN2PARAMS(dm.xlsx,DesignSheet,DefaultValues) should be FORWARD_MODEL DESIGN2PARAMS(<xls_filename>=dm.xlsx, <designsheet>=default, <defaultssheet>=DefaultValues)

What did you expect to happen?

Better error message

steps to reproduce

Environment where bug has been observed

• python 3.11
• python 3.12
• macosx
• rhel7
• rhel8
• local queue
• lsf queue
• slurm queue
• openPBS queue