I suspect it's because pielrf library needs to be installed where only users in the admin group have write access, and I haven't implemented the calls to show the user the normal "Input admin user and password" panel and use this for installing.
So you would need to either run as a user in admin group first time using PielrfGUI for installing pielrf library, or install pielrf without PielrfGUI application, or wait for me to implement the proper calls for enabling installation with the proper access rights.
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