Those of you that have recently upgraded to a new version of Mac OS may see an error the next time you use SVN:

xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun

It should be resolved by running the following in the terminal:

sudo xcode-select --reset

As it's a sudo command you'll need to provide an admin password.