The Simulator Can't Be Launched Because It Is Already in Use

xCode 6 (beta 4) keep getting The Simulator can't be launched because it is already in use.

"The Simulator can't be launched because it is already in use.”

1. This messege will be shown only if there is another xcode project that has launched simulator and hasnt stopped it yet, and u try to run the simulator from another xcode project.

2. Ideally stopping the simulator from the respective project(PS. not closing the application from the simulator, clicking the STOP button) would do it,
   But if it still is working like that, then Closing the simulator, or resetting the simulator contents.

3. If that still dsnt work, then as a last resort i would ask u to reinstall Xcode, as if this problem keeps going on, then ur downloaded file might be buggy.

P.S if u opt to re-download n install xcode please keep backup.

Hope it solves it. Although i want your problem to be solved by step 2.

When I try to run the Xcode simulator I get the error 'Stop “(null)”?'

Getting this as well with Xcode 7.

I've been following these simple steps to avoid seeing the error:

1. Build your app.
2. Run your app.

Annoying, and not a solution, but I think this is a bug within Xcode 7.

Simulator in use error message shown even after simultor is not running

Finally i found the solutions for above issue:

Two solutions are there:

First: Simple one solution

It happens when you have multiple instance running of Xcode. Check all instance of Xcode one of them showing that project running state (Even if your simulator is close). Click on Stop button of that Xcode instance will resolve this issue.

AGAIN !! You do not need to close Xcode.

Second: Complex one solution

If first solution does not work than follow this solution.

Activity monitor not showing any simulator process is running. Still the message shows "Simulator in use".

Its true, simulator process is not in a memory but other application is utilise it.

Like in my case i use to open many instances of Xcode. So there are instance of your application and other demo app or any third party app also.

So i did found that one of the third party application is use simulator even if i "Quit" simulator. That's why its keep saying that "Simulator in use". Shown in below image

The process AMSlideMenu is a third party control is used (i mean its Xcode instance is running). I just quit this process and message won't appear any more.

I am not saying that it is issue from AMSlideMenu. It is issue from Xcode environment, Sometimes one of its instance is keeping simulator process in use even if we quit Simulator.

Hope this will help any one who still facing this kind of issue, And not willing to quit Xcode to over come of this issue (because you are in middle of something and its not feasible to quit Xcode that time). :)

---

Related Topics