Open the terminal (select: Initiator-Other-Terminal):
(1). Enter xcode-select-install on the terminal and press Enter to install the command line tool.
⑵. Enter: code sign-f-s-deep/applications/appname.app on the terminal and press Enter to wait for the self-signed command to be executed.
Note: In some cases, when setting-> Security and privacy->; Allow opening "appName".