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Xcode – I can't solve 'Could not build the application for the simulator. '

Abel
July 20, 2021
196 views
4 votes
4 Answers

Yesterday, I created a flutter project named sample1.
and I worked fine.
but when I tried to open the file today and try to run it, I got an error.

the log says

Running "flutter pub get" in sample1...                            603ms
Launching lib/main.dart on iPhone 8 in debug mode...
Running pod install...                                           1,313ms
Running Xcode build...                                                  
Xcode build done.                                           11.8s
Failed to build iOS app
Error output from Xcode build:
↳
    ** BUILD FAILED **


Xcode's output:
↳

    Command PhaseScriptExecution failed with a nonzero exit code
    note: Using new build system
    note: Building targets in parallel
    note: Planning build
    note: Analyzing workspace
    note: Constructing build description
    note: Build preparation complete
    warning: Capabilities for Signing & Capabilities may not function correctly because its entitlements use a placeholder team ID. To resolve
    this, select a development team in the Runner editor. (in target 'Runner' from project 'Runner')

Could not build the application for the simulator.
Error launching application on iPhone 8.

I think I have tried everything written here, except the ones like

pub upgrade
pub run

because it says

zsh: command not found: pub

Could not build the application for the simulator. Error launching application on iPhone 11 Pro Max

The android version is working fine.
Please kindly help me.
Thank you

EDIT**
I just created a new project and it seemed to be working fine but I am afraid it won’t work next time I open it.

Answers

- Aristidios
- July 20, 2021 at 3:36 am
- 0 votes
0
Before Anything you will first need to Run a successful Xcode build on your desired iOS device or Simulator directly from Xcode!

If you’ve successfully done so head over to : the instructions to run with Hot Reload⚡️ on iOS from VsCode & Android Studio

If not – Follow this 8 steps to getting your Xcode Build Up & Running ->

1. Open Xcode – do all the classic Set Up (Signing in with your dev account as a Team & choosing a UNIQUE bundle Identifier)

2. If you don’t have cocoapods Installed on your Mac :

From terminal cd ~

then : for M1 Mac run the following :
```
arch -x86_64 sudo gem install ffi
sudo gem install cocoapods
```
while for intel macs just run :
```
sudo gem install cocoapods
```
3. Now once you have cocoapods installed on your machine
```
cd yourflutterprojectroot

flutter clean
flutter pub get
```
4. Update & install pods :

for M1 Macs :
```
cd ios
arch -x86_64 pod update
pod install
arch -x86_64 pod update
```
for intel macs :
```
cd ios
pod update
pod install
pod update
```
5. Connect your iPhone (if you want to run on real device)

In your iPhone Settings – set Auto-Lock to Never (& Unlock it !) – Connect your iPhone or iPad to Mac with USB cable & Accept Prompt "Trust Computer" on the iPhone

6. Run Xcode Build from Xcode make sure to Select your device or simulator

After running this alert should prompt select Ok

if this alert didn’t prompt & build failed totally Try setting your Runner > Info > Configurations like this but first try to see if you can do step 7 – if you can do it don’t change anything

7. In your iPhone Settings > General > A New Menu will have appeared – Navigate to it & Click « Verify App » or « Accept »

8. Now Run Xcode Build Again – it should build

— Xcode Build is done

💪🏽✨

Now –

You’ve done everything successfully 💪🏽✨ – congrats – it works –
- But what if you wanted to run directly from VSCode or Android Studio ?
It would make to long of a post – so i’ve split my answer for this second question :

find here the instructions to run with Hot Reload⚡️ on iOS from VsCode & Android Studio

See you there !
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- RavindraSPatil
- July 20, 2021 at 3:41 am
- 0 votes
0
You should try go to flutter/bin/cache delete cache folder inside bin folder then run flutter upgrade then flutter doctor and rerun your app

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- Jarvis098
- July 20, 2021 at 3:42 am
- 0 votes
0
Run command like flutter pub upgrade not just pub upgrade.

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- Aristidios
- July 20, 2021 at 11:13 am
- 0 votes
0
Your first question was on running your flutter app on iOS – you’ve done so by running your first Xcode Build : )

Now – I’ll answer for both VSCode & Android Studio – your second question :

How do i run my Flutter App with Hot Reload ⚡️ on a Real iOS device or Simulator ?

To get started you will first need to follow the instruction in my first answer & run a successful Xcode Build – directly from Xcode

Once you’ve done so follow this steps :
1. - Make sure your device is still connected & unlocked – Run flutter devices in Terminal :
It will tell you if your device or Simulator is detected (it should be since you’ve just done a successful Xcode build)
1. Open back your flutter project in VsCode or Android Studio & make sure your device is still unlocked – open a new simulator only if you want to run on Simulator
Do a first Hot Reload⚡️ using Terminal Commands :

Run flutter run in your flutter project root
or
run flutter run -d yourDeviceID
if it does not directly run on your iOS device or Simulator

You will find your iOS device ID here :

Select Add Additional Simulators

After running flutter run or flutter run -d yourDeviceID an error will prompt if it’s your first time running

Press Cancel & go to your Mac > Systems Preferences > Security & Privacy – & allow the file to execute

then wait a bit the app might launch on it’s own or try flutter run again or flutter run -d yourDeviceID

Once successful you can now use Hot Reload by pressing r in terminal
- to Hot Reload On Save in VsCode or Android Studio – follow bellow instructions :
Hot Reload⚡️Using VsCode :

Press F8 or Select ▷ « Start Debugging » in main.dart

That’s it ! You now have the power of Hot Reload⚡️ with VsCode on a physical device ! 💪🏽

Hot Reload⚡️on Android Studio :

Select your iOS device & run (it should appear if you’ve followed everyting correctly)
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