Put TCNumber in a label, too. Is the template repeater's .indexParamName
exactly matching TCNumber
?
Wait.... Where does your template get HeaterNumber if you are using the template repeater to supply TCNumber? Sounds like you need to use dataset mode in your repeater, in order to supply more than just an index number to the template.
If you are already using dataset mode in the repeater, make sure your dataset column names exactly match the template parameter names.