Hi there, The sender is sandboxed. The sender and target applications are under my control. In case of sending by bundle іdentifier: I already set com.apple.security.app-sandbox to false because I got an error procNotFound -600  in the receiver. Also com.apple.security.scripting-targets or com.apple.security.temporary-exception.apple-events solves this problem. When sending by eppc - I still get errAEPrivilegeError/-10004\ parallel

Hey, thanks for your reply! The sender is sandboxed. The sender and target applications are under my control. In case of sending by bundle іdentifier: I already set com.apple.security.app-sandbox to false because I got an error procNotFound -600  in the receiver. Also com.apple.security.scripting-targets or com.apple.security.temporary-exception.apple-events solves this problem. When sending by eppc - I still get errAEPrivilegeError/-10004\ parallel