Codesign Error

[Marty Knapp]

This isn't strictly a LiveCode question but maybe someone here can help 
. . .

I'm trying to use the terminal to codesign an app for the Mac app store 
and I'm getting an "identity not found" error. I have downloaded and 
installed the WWDR intermediate certificate into KeyChain, created, 
downloaded and installed the developer certificate into KeyChain. I have 
also added to the plist file: LSApplicationCategoryType 
public.app-category.productivity: Productivity

I wasn't sure if I was supposed to add the whole category string, so I 
also tried setting the category to just "Productivity."

I have also added the proper CFBundleIdentifier

I've Googled the error code "identity not found" and am not coming up 
with much. Same on the Apple Dev support forum. I can't tell if this is 
a certificate issue, a plist issue, or "I'm just stupid issue!" Anybody 
wanna tell me where to go?

Thanks,
Marty Knapp