Having problems with iOS Simulator

Hi guys,

i am new to iOS Development and started with the tutorial series made by Chris. It is awesome.
But i have a huge problem.

Building my app is no problem, but when i try to simulate it the simulator crashes.


The request to open “de.Demo” failed.
Domain: FBSOpenApplicationServiceErrorDomain
Code: 5
Failure Reason: Unexpected error type.
User Info: {
BSErrorCodeDescription = InvalidResponse;

The operation couldn’t be completed. (BSServiceConnectionErrorDomain error 3.)
Domain: BSServiceConnectionErrorDomain
Code: 3
User Info: {
BSErrorCodeDescription = OperationFailed;

System Information

macOS Version 10.15.4 (Build 19E287)
Xcode 11.4.1 (16137)

Is there anybody who have experience dealing with that problem ?


Hi Kristof.

Welcome to the community.

Can you post a screenshot of your Xcode window so that we can see what simulator you are trying to use?

Similar to this example:

Hi Chris,

thanks for having me.

The problem is solved. It wasn’t a problem of xcode.
I used a VirtualBox VM and this was the problem at all.

Thanks for your help :slight_smile:

**For those of us who got here, the solution is: **
Run these two lines on CMD:
cd C:\Program Files\Oracle\Virtualbox
VBoxManage setextradata “Your name of virtual machine” VBoxInternal/CPUM/IsaExts/AVX 0
VBoxManage setextradata “Your name of virtual machine” VBoxInternal/CPUM/IsaExts/AVX2 0
(Sorry for my English.)

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I love you man. You save my day. I have been at this for hours.