Hi, what helped for me [IOS 11.6 Big Sur - XCode 13.1] rvictl had 2 locations on 'which' command, one with a double // $ which -a rvictl /Library/Apple/usr/bin//rvictl /Library/Apple/usr/bin/rvictl removing the '/Library/Apple/usr/bin//rvictl' from the PATH variable helped for me. I hope it works well for you too :-) #list the PATH variables: $ echo $PATH /usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Library/Apple/usr/bin/:/usr/local/share/dotnet:/opt/X11/bin:~/.dotnet/tools:/Library/Apple/usr/bin:/Library/Frameworks/Mono.framework/Versions/Current/Commands:/Applications/Wireshark.app/Contents/MacOS #copy the returned variable and remove the one with //rvictl and overwrite with the new paths: $ export PATH=/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/share/dotnet:/opt/X11/bin:~/.dotnet/tools:/Library/Apple/usr/bin:/Library/Frameworks/Mono.framework/Versions/Current/Commands:/Applications/Wireshark.app/Contents/MacOS Now the 'which' command should only return a single instance: $ which -a rvictl /Library/Apple/usr/bin/rvictl