It is likely you migrated some files from another Mac that had some old Blackberry software on it that is no longer maintained. It is attempting to run on your computer and your Mac does not like that fact that it is either not signed or no longer compatible. I can give you a couple of common Blackberry files to look for. You will want to start in the Finder and in the menubar choose Go > Go to Folder, and enter /Library/LaunchAgents. Remove any of the files that contain the words below or other BB file.
- BBAlbumArtCacher.plist
- BBLaunchAgent.plist
If you do not have those files are removing them did not help, then I suggest posting the free EtreCheck report using the Additional Text Option when posting. The report contains no personal information, but will identify the files in your Launch Folder that may be the problem.
How to use the Add Text Feature When Post… - Apple Community