XCode Error on opening

Hi there,

I have a problem with opening the project in Xcode.

We code in VSC on windows machine.
The building on windows works without any error.

Commands i tried:

ionic cordova prepare ios --prod
Ionic cordova build ios --prod

Later i copy the plattform/ios folder to the mac.

Opening the xcworkspace or xcodeproj gives me an generic error

“The project is damaged and cannot be opened due to a parse error.
Examine the project file for invalid edits or unresolved source control conflicts.”

Ionic info //windows machine

   Ionic CLI          : 5.4.16
   Ionic Framework    : ionic-angular 3.9.2
   @ionic/app-scripts : 3.2.3

   Cordova CLI       : 9.0.0 (cordova-lib@9.0.1)
   Cordova Platforms : android 8.1.0, ios 5.1.1
   Cordova Plugins   : cordova-plugin-ionic-keyboard 2.1.3, cordova-plugin-ionic-webview 2.4.1, (and 18 other plugins)

   cordova-res                          : not installed
   native-run (update available: 1.5.0) : 1.3.0

   NodeJS : v10.14.2 (C:\Program Files\nodejs\node.exe)
   npm    : 6.4.1
   OS     : Windows 10

Has anyone an hint how to get more details of the error?

Thank you for your help.