question

It looks like the problem is with you Process activities and how they are expecting Staff to be referenced in the "Involved Resources" section of the Advanced properties for the activities.

For example, the first error in the console when I opened the model said the problem was in the RNs Doff container, in the activity called "Process" (the error text RNs Doff/Process indicates this).

So I looked at that activity and found this:

This blank field is what's causing the error. The acquired staff involved in this process is expected to be referenced here. You can use the Sampler tool on the input field to associate the right staff with this process, or you can click the red 'X' if you don't need the staff's state data captured for this process.

I looked through all the activities referenced in the error console, and they are all similar to this example.

If you go through and fill in these missing inputs or remove them from the process activities you should be good to go.