- Open Keychain Access.
- In the top-left corner, unlock the keychain (if it is locked).
- Choose the System keychain from the top-left corner.
- Find your distribution certificate and click the disclosure triangle.
- Double-click ‘Private key’ under your distribution certificate.
- In the popup, go to the Access Control tab.
- Select ‘Allow all applications to access this item’.
- Save the changes.
- Close all windows.
- Run the application.