Xcode 9: Could not attach to pid

ios xcode xcode9
Krunal picture Krunal · Jun 20, 2017 · Viewed 35.6k times · Source

I've been facing an issue (frequently) with the recent major release of the iOS application development tool - Xcode 9-beta.

It's showing me the following error frequently while running/debugging app in Simulator (iOS 11).

Could not attach to pid : “2370”
Ensure <project title> is not already running, and <system username> has permission to debug it.

Here is a snapshot for the same issue:

error message - Could not attach to pid

What would be permanent solution of this issue, as it's disturbing frequently?

Answer

ninja_iOS picture ninja_iOS · Oct 17, 2018

If issue is on OS Mojave and you are trying, like me to run tests on older Xcode version (lower than 10.0), make sure that in your scheme, when you select Test, Debug executable is disabled

enter image description here

You won't be able to debug tests from this point

Related questions

Fixing Xcode 9 issue: "iPhone is busy: Preparing debugger support for iPhone"

I'm looking for more information on the message below. Xcode 9 seems to be hanging for a couple minutes already... How can I tell Xcode 9 to quickly recognize my previously used device updated to iOS 11? .Alex’s iPhone is busy: Preparing …

Read More
How do you perform wireless debugging in Xcode 9 with iOS 11, Apple TV 4K, etc?

Wireless debugging was recently added as a feature in Xcode 9, iOS 11, and tvOS 11. Apple TV 4K doesn't have a USB port, so it requires wireless debugging. How do you perform this wireless debugging in Xcode?

Read More
Xcode 9 Swift Language Version (SWIFT_VERSION)

I've recently updated xcode to version 9. Before that in Xcode 8.x whenever I use to do pod update it shows me an update code to convert the code to Swift 3 and doing that solve the errors. But now it is …

Read More