I'm confused. Based on the screenshot you provided, you allocated 1 converter. Yet the message says:
"Number of converter must be set between 1 and 24." I'm assuming that means '1' inclusive which you already have.
You are correct, one converter was allocated, click OK, message in Creator pops up.
I suspect this is a bug, or the range should be defined as 2-24. The latter seems less plausible.
Editing the exported configuration XML file yields the same result.
@Cypress Any chance of a clarification?
Thanks for confirming Hari.