Did you check the configuration settings for the plugin on the Admin page?
If that's OK... just a stab in the dark... did you try changing the syntax from upper case "Sales" to lowercase "sales":
{{NEWPAGE>sales}}
BTW, I've used this plug-in in the past, but it was too confusing for most of my users. So I simplified the process by using the "PageHere" plugin (
https://www.dokuwiki.org/plugin:pagehere).