Formatter doesn't exist for type number

Hey all,

Quick one:

I’ getting an error when I try to use a formatter, looking up a number and replacing with text. This is the ‘warning’ in the console - which accumulates to 100’s and 100’s of warnings on the same page as I scroll (repeat group):

dmxAppConnect.js:7 Formatter replace in expression [require_sponsorship.replace(1, ‘Yes’).replace(0, ‘No’)] doesn’t exist for type number

Here is what I have in the data binder:

Clearly doing something wrong here! Can anyone point me in the right direction? Is it not possible to replace a number with text, for example and I need to look for alternatives?