How do I fix the xcrun unable to find simctl error?

I solved this problem by entering

Xcode > Preferences > Locations 

And assigning the Command Line Tools

https://i.stack.imgur.com/Tfhrg.png

In Xcode, open the Xcode menu at the top, then select Preferences…, and then select the Locations tab.

https://i.stack.imgur.com/nMZnt.png

Got similar issue on executing command

./Scripts/bootstrap.sh -d.

This helped me Xcode > Preferences > Locations, Set Command line Tools

https://i.stack.imgur.com/kSOuz.png

In Terminal, try this.

sudo xcode-select -s /Applications/Xcode.app

/Applications/Xcode.app is your Xcode.app path.

if U still get error in terminal.

try sudo xcodebuild -license to agree license.

I had the same problem. My application was working well but suddenly in next run, it started throwing the "simctl" error. It seems I had started Xcode update installation in the background.

Fix: I just started the Xcode application and it prompted to install some pending tools update. After Xcode updates, my app started working normally.

While running Xcode, open the Xcode menu, go to Preferences…, then select Locations

In Locations, "Command Line Tools", choose your version of Xcode.

It should be fine. This worked for me.

Choose Xcode Preferences then choose Locations tab and inside go to command line tools Drop down box and choose one.

Problem sovled !

FYI: I tried this with Xcode 12.3

If you are interested in command line "approach", please try: installer -pkg /Applications/Xcode.app/Contents/Resources/Packages/XcodeSystemResources.pkg -target /. In addition, please make sure that xcode-select -s selected right Xcode installation path.

adding xcode in preference-> locations works fine