Build Phase Copy Files triggering certificate error

I think an xcode or OS update might've messed up one of my Mac application projects. The Build Phase > Copy Files action to copy the newly built app to another folder triggers the following:


error: Embedded binary is not signed with the same certificate as the parent app. Verify the embedded binary target's code sign settings match the parent app's.


Embedded Binary Signing Certificate: Not Code Signed

Parent App Signing Certificate: Developer ID Application: **** (*******)



This build phase happens after everything is built and I think the code signing is correct since without this build phase everything compiles and the app will run without issues.


Another posting suggested checking the Keychain to make sure all the relevant certificates under login had their Trust set to "Use System Defaults" which mine are, so I'm at a loss on what to check next.