I think you can still run the PlateViewer as long as you set something the plate_shape to something reasonable (like 96) in the properties file and the plate_id and well_id to something; you can edit that in any text editor you like. It’ll be nonsense, but it doesn’t actually matter.
I suspect that’s not actually necessary though, because I just tried doing this myself on some sample data and you can definitely match the hit table to your data in the Histogram tool, at least in my hands. I did manage to replicate your error in one particular set of circumstances though- after you hit OTHER TABLE, it asks what kind of data you’re adding (per well, per image, etc). The box that comes up LOOKS like it’s a dropdown, but it’s not, so if you arrow down to “per image” and then hit enter without clicking on it, “per well” is actually still selected and if I used a dataset without plate or well metadata I got the same exact error that you did. If you make the box bigger and CLICK on the “per image” option, do you then get a question box asking whether your table represents a new set of images? If so, click “No”, then you should get a table that looks like the one I’ve posted below and you should be on your way. Can you check if this is also how you were getting to that error? If so, that should be an easy fix, though I may file a UI improvement ticket on it because that box comes up a very confusing size. If not, you may want to try the properties file trick I just mentioned.