report.executeAndDistribute: Error Serializing Parameters

Hi there,
I am using the following code to attempt to print a report (using its default parameters) and I keep getting this error. I do not know what’s causing it. I can’t find any examples for the “print” action for the execute and distribute scripting function in the manual, so I’m not 100% sure whether I’m doing it correctly.

            packList = event.source.parent.getComponent("power_table").data.getValueAt(row, "PackList")
	datestr = str(event.source.parent.getComponent("power_table").data.getValueAt(row, "Ship Date"))
	printer = event.source.parent.getComponent('printer_dropdown')
	settings = {"primaryPrinterName":printer,"copies":1 }
	_parameters = {"PackListNo":packList, "Date":datestr} = 'PackList',
	project = 'Our_Project_Name_',
	action = 'print',
	actionSettings = settings)

I’ve verified that the printer name is correct, the project name is correct, and I’ve tried passing the date as both a date object and a string with no effect.

Well of course I found the error only after making a post, but it was because I was not specifying the “.selectedLabel” for the printer dropdown component, I was passing in the whole component instead!