Xcode 6 Beta 3: Simulator Issue - ios

I am currently experiencing problems launching the Xcode 6 Beta 3 Simulator. Once I launch the IOS Simulator the error "Unable to boot the IOS Simulator." appears. Following the IOS Simulator error, I then get an error from xcode reading "Unable to run app in Simulator An error was encountered while running (Domain = DTiPhoneSimulatorErrorDomain, Code = 2)".
I went to Xcode/preference/Downloads with intentions of seeing a IOS 8.0 Simulator but there was none. Could this be the problem? Am I suppose to have a IOS 8.0 Simulator? If so can someone direct me how to get it? Also, under the "Downloads" tab in Xcode preference I do see IOS 7.0 and 7.1 Simulators and both work fine with Xocde 5.

Reset Content and Settings in iOS Simulator, close it, and then build again.

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device iPhone5s iOS 9.3
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How to get rid of this problem & having my project running on my iPad?
I think that you have to update XCode - most times I got this error was when I updated device but didn't update XCode.
My xcode is 7.2 for 9.2 iOS.

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I keep getting the following error on XCode 7.1 (beta), for an iPad running on iOS 9:
An error was encountered while enabling development on this device.
Please try rebooting and reconnecting the device. (0xE8000076)
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Xcode cannot connect to IOS simulator

Recently, i often get an error when compile to the simulator:
My solution is to close the simulator and re-compile the app, most of the time, it works. But this is annoying for me. Is there any better solution?
Env:
Xcode version:6.1.1
Simulator version8.1
you can solve the issue in some more type
choice - 1
Restart Mac can solve the problem for me.
choice - 2
In this case,tried to run the app on a iPhone 6 simulator when I got this error. Quitted the simulator only and re-ran the app on iPhone 5s (8.1) - it worked fine.
After a while I changed the target back to iPhone 6 (without quitting it), and ran the app against it - no error shown..
choice no-3
iOS Simulator > Reset Contents and Settings...
Try to reset your simulator
IOS Simulator => reset content and settings..

Simulators missing in Xcode6 beta6

I'm having weird problem in XCode6 beta6. In preferences, downloads there is only one simulator (iOS8) showing as downloaded. No other simulators available.
In addition trying to execute my project on simulator causes this same error mentioned in another question: Unable to run app in Simulator : Xcode beta 6 iOS 8
Removing simulators and adding them back seems to crash Xcode most of the time but even if successful the simulator won't run. Rebooting the machine doesn't help either.
Anyone having similar problems and solution?

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