Unable to launch iOS7.1 simulator in Xcode 6.2 instruments - xcode

Code which was working fine in xcode 6.1.1 now fails to launch the iOS 7.1 simulator in xcode 6.2 (but works fine for the iOS 8.2 sim).
Here is the command I am using:
instruments -t Automation -w /Users/USER/Library/Developer/CoreSimulator/Devices/233D1DE0-8660-4D98-8E45-5E0794CF7366 /Users/USER/Library/Developer/CoreSimulator/Devices/233D1DE0-8660-4D98-8E45-5E0794CF7366/data/Applications/APPNAME/APPNAME.app -v -l 20
This is the error returned:
instruments[2274:66214] -[UIAInstrument(UIAInstrument_Simulator) _startAgentForApp:withPID:]: Warning: Automation instrument could not locate sim tool.
That command launches the simulator and briefly shows the app's splash screen, then dumps out.
Any ideas?

You may go to xCode -> Preference -> downloads and see in iOS Simulator 7.1 is downloaded or not, if it is not downloaded then download and install it, it might work for you

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Mac - Appium - How to setup Xcode simulator with specific OS version and .app file through command line

While setting up Appium on Mac, I am stuck at a point where we have got .app file to automate on an iphone simulator.
I am able to launch app which comes with .xcodeproj on Xcode.
But now I have an MyApp.app file to use on a Simulator. if I try to open a simulator using UDID it always open latest iOS version on Latest iPhone Simulator using this command:
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I need to open this on a specific iOS version on specific device then install MyApp.app on it. (also I am not able to get bundle id of app; not sure at which step I can do this)
Moreover, it Would be great if you can also share settings for Appium Inspector and where to fetch values from ?

XCode Simulator mozilla-mobile/firefox-ios: Firefox for iOS Build error

Monterey 12.6.1
Xcode :Version 14.1 (14B47b)
I am getting a compilation error even though I follow the instructions in the "README.md" file.
Open Client.xcodeproj in Xcode.
Build the Fennec scheme in Xcode.
I can't pass these steps.
https://github.com/mozilla-mobile/firefox-ios
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Error Message
I wanted to run firefox application in ios simulator. I got a compile error.

When launching an iOS simulator it closes straight away but still runs in the background

When I try to run a project (even a default single view app) in Xcode 10.2 (also occoured on Xcode 10.3 and beta 11 build 3) the simulator launches but then closes but Xcode still thinks it's running (looks like it is running headless). Any ideas on how I can see the simulator?
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Uninstalling and re-installing Xcode (making sure to delete all related directories and doing a system restart)
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Clearing Derived data ~/Library/Developer/Xcode/DerivedData/
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I finally upgraded to Yosemite but also had this issue on Mavericks.
I downloaded xCode5.1.1 and installed moving to Applications folder and selecting "Keep both", so it renamed the Xcode.app folder to Xcode 2.app. I renamed it to Xcode5.app then.
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I'm getting an error message while trying to run an application developed in Xcode 5.1 iOS 7.1 on Xcode 6.1 for iOS 8.0. The error state that 'Unable to run app in Simulator' as show in below screenshot.
I have tried below mentioned solution but none seems to work :
Reset the content of simulator
Rebooted mac after installing Xcode 6.1.
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Delete /etc/launchd.conf if it exists on your system and reboot. See Unable to boot iOS 8 Simulator

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