I'm in the same boat. Invalid input. I tried a little troubleshooting I looked in the .ini file to locate the path I went to the folder and modified one of the .csv files that is out of the box. I added a row of data on the bottom of the list saved it. Then when i opened that family and put the value in the lookupvalue parameter it returned with a false result that it didn't find the info. This tells me that Revit is not scanning the csv file i modified but i don't know why. I did close and restart revit after making csv modifications. This is really starting to get on my nerves.