W hile your development you might face error "Xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools)". I have faced this issue today while using Git. You can also face this issue after your macOs upgradation. I was unable to execute any Git command although I have installed Git in my machine. Let's see how to get rid of this issue.

Solution for error - Xcrun: error: invalid active developer path:

To solve this issue you need to update your Xcode Command-line Tools.
To update your "Xcode Command-line Tools", open your terminal and execute following command:

xcode-select --install

You'll then receive the following output:

code-select: note: install requested for command line developer tools

Snapshot:

Xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools)

After executing the command, You will then be prompted in a window to update Xcode Command Line tools. (which may take a while)

Xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools)

Now click on install and it'll ask for password, then enter the machine's password.

Xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools)

Now it'll start the downloading the software and will update it.
If it'll ask for try again, click on try again

Xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools)

Then it'll start the downloading:

Xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools)

After successfull download, you can see the error "Xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools)" will not be exist.

Xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools)

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Now, you can see the problem "Xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools)" is resolved after udating the softwares.