To fix this permission issue, you can use the Terminal application (you can find it in Application>Utilities) and enter the following commands:
sudo chgrp wheel /Library/PrivilegedHelperTools
sudo chmod 1755 /Library/PrivilegedHelperTools
If it’s still not working can you close Audirvāna and do the three commands below in Terminal:
sudo launchctl load -w /Library/LaunchDaemons/com.audirvana.SysOptimizerTool.plist
sudo rm /Library/PrivilegedHelperTools/com.audirvana.SysOptimizerTool
sudo rm /Library/LaunchDaemons/com.audirvana.SysOptimizerTool.plist
Open Audirvana and play a track to check if you still get the error.
Note: if the above step didn't worked, please create a ticket.
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