XCode command tools may be required to troubleshoot your app and may not be present after an upgrade.
To determine if you have already installed it use the following
xcode-select -p
If the following is returned then the tools are installed
/Applications/Xcode.app/Contents/Developer
To install simply type in a terminal window
xcode-select --install
If its already installed you may get the following error
error: command line tools are already installed, use "Software Update" to install update
If not follow the dialog prompts and check with command when complete
xcode-select –p
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