After updating cocoapods it is not generating Podfile.lock

[Alfredo Sass]

It is showing this message when I run pod install:

Pod installation complete! There are 0 dependencies from the Podfile and 0 total pods installed.

In Podfile.lock it only appears:

PODFILE CHECKSUM: 5ada3782c16649731dd16e7a93753acb0d5d4856

COCOAPODS: 1.10.1

My Xcode

Version 11.2.1 (11B500)

Flutter doctor:

[✓] Flutter (Channel stable, 2.0.1, on Mac OS X 10.14.6 18G7016 darwin-x64,

    locale pt-BR)

    • Flutter version 2.0.1 at /Applications/flutter

    • Framework revision c5a4b4029c (7 days ago), 2021-03-04 09:47:48 -0800

    • Engine revision 40441def69

    • Dart version 2.12.0

[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.3)

    • Android SDK at /Users/boss/Library/Android/sdk/

    • Platform android-29, build-tools 29.0.3

    • ANDROID_HOME = /Users/boss/Library/Android/sdk/

    • Java binary at: /Applications/Android

      Studio.app/Contents/jre/jdk/Contents/Home/bin/java

    • Java version OpenJDK Runtime Environment (build

      1.8.0_242-release-1644-b3-6915495)

    • All Android licenses accepted.

[!] Xcode - develop for iOS and macOS

    • Xcode at /Applications/Xcode.app/Contents/Developer

    • Xcode 11.2.1, Build version 11B500

    ! Xcode 11.2.1 out of date (12.0.1 is recommended).

      Download the latest version or update via the Mac App Store.

    • CocoaPods version 1.10.1

[✓] Chrome - develop for the web

    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 4.1)

    • Android Studio at /Applications/Android Studio.app/Contents

    • Flutter plugin can be installed from:

      🔨 https://plugins.jetbrains.com/plugin/9212-flutter

    • Dart plugin can be installed from:

      🔨 https://plugins.jetbrains.com/plugin/6351-dart

    • Java version OpenJDK Runtime Environment (build

      1.8.0_242-release-1644-b3-6915495)

[✓] Connected device (1 available)

    • Chrome (web) • chrome • web-javascript • Google Chrome 89.0.4389.82

Before everything was working.

What could be happening?