I you do a debug build and you get the error:
Application failed codesign verification. The signature was invalid, or it was not signed with an Apple submission certificate. (-19011)
it might help to deactivate the checkbox
Project -> Edit Active Target -> Validate Build Product
in XCode.
All this does is mask the error temporarily, for local builds. If you try to submit this to Apple, the App Loader will prohibit the submission due to the same error. Better off solving the problem now, which is usually caused by duplicate certificates in the keychain, or a mismatched BundleID somewhere.
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