Hi, I would like to know if its possible to open an NSAlert or some kind of customized window to ask for pin in a smartcard extension in macos. I'm developing an cryptotoken kit smartcard extension and i would like to open a customized pin window to ask the pin or OTP for a user. But when i try to open a simple nsalert, the console informs me the following error: NSInternalInconsistencyException', reason: 'NSWindow drag regions should only be invalidated on the Main Thread!' To this simple code: NSAlert* msgBox1 = [[NSAlert alloc] init];       [msgBox1 setMessageText: @"Welcome !"];   [msgBox1 addButtonWithTitle : @"OK"];   [msgBox1 runModal]; This is in the tokensession.m, signData method.