I can see this error too when I click on preview:
But it’s working:
Seems like a bug
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Sorry, it should be TotalUIDs.join(',', 'CID').split(',')
I think we have a bug, you are correct.
When I add the CID item here, Wappler is not saving the parameter property:
‘CID’ is blank, yet it has been saved many times.
I’ll get a bug report sorted for this in the morning, many thanks @franse for your assistance, thank you too to everyone who contributed, you all saved my sanity 
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