Could not attach to pid : “####” unable to attach

Question

I just updated to Xcode 7.3.1 and my project crashes with the same error after the launch screen displays on the iOS simulator.

The error is:

"Could not attach to pid : “1712” unable to attach"

Then I tried running another project and I got:

"Could not attach to pid : “2025” unable to attach"

Any solutions?

None of the answers on this page worked for me. I found a solution involving attaching to the process already running in the simulator. This page no longer allows answers, so I am putting the details here: https://stackoverflow.com/a/59304312/384670 — M Katz, Dec 12 '19 at 12:14
De-Selecting Debug Executable option under edit scheme fixed it for me! — Ramesh Vishnoi, Jan 25 '23 at 02:18

score 37 · Answer 1 · edited Jul 20 '19 at 19:28

37

Resetting the content and settings in the simulator worked for me. This is available on the iOS Simulator: Hardware -> Erase all Content and Settings

edited Jul 20 '19 at 19:28

Community

1
1

answered Jun 02 '16 at 04:16

Himanshu

2,832
4
23
51

1

in most of the cases, this is actually the correct answer. – xGoPox Jan 21 '17 at 11:05
6

The menu item is now called _Hardware -> Erase All Content And Settings_. – Vidar S. Ramdal Feb 19 '18 at 09:36
4

The menu item is now called Device -> Erase All Content And Settings – Kirill Jun 01 '20 at 18:49

score 22 · Answer 2 · answered Jun 02 '16 at 05:49

22

Kill the simulator, then re-build.

answered Jun 02 '16 at 05:49

dogsgod

6,267
6
25
53

5

Actually, you don't even need to kill the simulator, re-building make it work for me. – n3wbie Oct 17 '16 at 08:41
2

I usually just re-**run** it. But re-**building** is what's intended here. – mfaani Aug 07 '18 at 19:24
4

None of these worked for me. killing the simulator, deleting the app, switching simulator, rebuilding, deleting derived data, cleaning build folder, cleaning project, none worked. – Hedylove Jun 13 '19 at 20:30

score 18 · Answer 3 · answered Mar 02 '18 at 08:42

18

I closed Xcode.
On the simulator menu: go to Hardware -> Erase all content and settings.
Open Xcode then build and run the application.

The above simple steps worked for me.

answered Mar 02 '18 at 08:42

Lehlohonolo_Isaac

1,426
13
15

1

The order of the steps as shown here solved it for me. – Russ May 26 '19 at 20:19

score 9 · Answer 4 · answered Dec 12 '17 at 00:51

9

Close Xcode & simulator
Reopen Xcode & rebuild

Above steps worked for me.

answered Dec 12 '17 at 00:51

Will Gwo

403
3
6

score 7 · Answer 5 · answered May 18 '17 at 04:44

7

In my case Xcode 8.0 after this error,just rebuild again project it solves this problem.

There is no need for reset app content in iPhone device.

answered May 18 '17 at 04:44

harp

123
1
4

score -1 · Answer 6 · answered Oct 05 '17 at 02:00

-1

Clean the project,quit the simulator and then rebuild the app

answered Oct 05 '17 at 02:00

Ash

19
1

Cleaning the project and then running always make the trick for me. – ChavirA Jan 30 '19 at 20:51

Could not attach to pid : “####” unable to attach

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