Error happen when build. Only with iOS

[letruonglamit]

I have issue when build iOS

I receive a debug console below:

Launching lib/main.dart on iPhone XR in debug mode...
Warning: CocoaPods recommended version 1.5.0 or greater not installed.
Pods handling may fail on some projects involving plugins.
To upgrade:
brew upgrade cocoapods
pod setup

Xcode build done. 14.7s
Failed to build iOS app
Error output from Xcode build:
↳
** BUILD FAILED **
Xcode's output:
↳
=== BUILD TARGET url_launcher OF PROJECT Pods WITH CONFIGURATION Debug ===
:1:9: note: in file included from :1:
#import "Headers/permission_handler-umbrella.h"
^
/Users/lelam/WorkSpaceFlutter/GSYGithubAppFlutter/ios/Pods/Target Support Files/permission_handler/permission_handler-umbrella.h:13:9: error: include of non-modular header inside framework module 'permission_handler': '/Users/lelam/flutter/.pub-cache/hosted/pub.dartlang.org/permission_handler-2.0.0/ios/Classes/PermissionHandlerPlugin.h'
#import "PermissionHandlerPlugin.h"
^
:0: error: could not build Objective-C module 'permission_handler'
:1:9: note: in file included from :1:
#import "Headers/permission_handler-umbrella.h"
^
/Users/lelam/WorkSpaceFlutter/GSYGithubAppFlutter/ios/Pods/Target Support Files/permission_handler/permission_handler-umbrella.h:13:9: error: include of non-modular header inside framework module 'permission_handler': '/Users/lelam/flutter/.pub-cache/hosted/pub.dartlang.org/permission_handler-2.0.0/ios/Classes/PermissionHandlerPlugin.h'
#import "PermissionHandlerPlugin.h"
^
:0: error: could not build Objective-C module 'permission_handler'
:1:9: note: in file included from :1:
#import "Headers/permission_handler-umbrella.h"
^
/Users/lelam/WorkSpaceFlutter/GSYGithubAppFlutter/ios/Pods/Target Support Files/permission_handler/permission_handler-umbrella.h:13:9: error: include of non-modular header inside framework module 'permission_handler': '/Users/lelam/flutter/.pub-cache/hosted/pub.dartlang.org/permission_handler-2.0.0/ios/Classes/PermissionHandlerPlugin.h'
#import "PermissionHandlerPlugin.h"
^
:0: error: could not build Objective-C module 'permission_handler'
:1:9: note: in file included from :1:
#import "Headers/permission_handler-umbrella.h"
^
/Users/lelam/WorkSpaceFlutter/GSYGithubAppFlutter/ios/Pods/Target Support Files/permission_handler/permission_handler-umbrella.h:13:9: error: include of non-modular header inside framework module 'permission_handler': '/Users/lelam/flutter/.pub-cache/hosted/pub.dartlang.org/permission_handler-2.0.0/ios/Classes/PermissionHandlerPlugin.h'
#import "PermissionHandlerPlugin.h"
^
:0: error: could not build Objective-C module 'permission_handler'
:1:9: note: in file included from :1:
#import "Headers/permission_handler-umbrella.h"
^
/Users/lelam/WorkSpaceFlutter/GSYGithubAppFlutter/ios/Pods/Target Support Files/permission_handler/permission_handler-umbrella.h:13:9: error: include of non-modular header inside framework module 'permission_handler': '/Users/lelam/flutter/.pub-cache/hosted/pub.dartlang.org/permission_handler-2.0.0/ios/Classes/PermissionHandlerPlugin.h'
#import "PermissionHandlerPlugin.h"
^
:0: error: could not build Objective-C module 'permission_handler'
:1:9: note: in file included from :1:
#import "Headers/permission_handler-umbrella.h"
^
:0: error: could not build Objective-C module 'permission_handler'
Could not build the application for the simulator.
Error launching application on iPhone XR.
Exited (sigterm)

Flutter doctor:

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, v1.0.0, on Mac OS X 10.13.6 17G65, locale en-US)
[!] Android toolchain - develop for Android devices (Android SDK 28.0.3)
! Some Android licenses not accepted. To resolve this, run: flutter doctor --android-licenses
[!] iOS toolchain - develop for iOS devices (Xcode 10.1)
! CocoaPods out of date (1.5.0 is recommended).
CocoaPods is used to retrieve the iOS platform side's plugin code that responds to your plugin
usage on the Dart side.
Without resolving iOS dependencies with CocoaPods, plugins will not work on iOS.
For more info, see https://flutter.io/platform-plugins
To upgrade:
brew upgrade cocoapods
pod setup
[✓] Android Studio (version 3.2)
[✓] VS Code (version 1.30.1)
[✓] Connected device (1 available)

! Doctor found issues in 2 categories.

[CarGuo]

plugin permission_handler

[letruonglamit]

How to fix this issue?

[CarGuo]

find permission_handler is it installed?