xcode 12.0 throws error Capacitor.framework: code object is not signed at all

when I run application with:

ionic capacitor run ios --external

in Xcode 12.0 I stuck with error:

Capacitor.framework: code object is not signed at all In architecture: x86_64
Command PhaseScriptExecution failed with a nonzero exit code

I am working with:

"@capacitor/core": "2.4.0"
"@capacitor/ios": "2.4.1"
"@ionic/angular": "5.3.2"