Flutter iOS simulator launch error: arm64 not compatible with x86_64 + slow startup

Question

I’m facing delays launching my Flutter app on the iOS simulator. Here's the key error:

Error creating LLDB target... target architecture: arm64: not compatible with x86_64-apple-ios12.0.0-simulator...
Using an empty LLDB target instead but this can cause slow memory reads.

Also getting:

[FirebaseCore][I-COR000012] Could not locate configuration file: 'GoogleService-Info.plist'.

Details: macOS (M2), Dart Version: 3.7.2 Flutter Version: 3.29.2, Xcode Version 16.3 (16E140)

iOS simulator (x86_64) vs app built for arm64

Tried:

flutter clean, rebuilt

Removed DerivedData

Added GoogleService-Info.plist (still warning)

Questions:

How to fix arm64 vs x86_64 mismatch?

Is LLDB target issue slowing down launch?

Can I ignore the Firebase config warning?

Subratsss · Accepted Answer · 2025-05-21 07:43:21Z

0

After upgrading Flutter on my MacBook, it is working fine.

Flutter 3.29.3 • channel stable • https://github.com/flutter/flutter.git
Framework • revision ea121f8859 (6 weeks ago) • 2025-04-11 19:10:07 +0000
Engine • revision cf56914b32
Tools • Dart 3.7.2 • DevTools 2.42.3

answered May 21 at 7:43

Subratsss

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