Flutter macOS high Sierra error

I follow the instruction on Flutter site. Flutter Doctor warning is below. My problem I don't know how to overcome from this error, warning etc.

Any help please?

/Users/niyazitoros/development/flutter/flutter/bin/flutter --no-color doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel beta, v0.2.3, on Mac OS X 10.13.4 17E199, locale tr-TR)
[!] Android toolchain - develop for Android devices (Android SDK 27.0.3)
    ! Some Android licenses not accepted.  To resolve this, run: flutter doctor --android-licenses
[!] iOS toolchain - develop for iOS devices (Xcode 9.3)
    ✗ Missing Xcode dependency: Python module "six".
      Install via 'pip install six' or 'sudo easy_install six'.
    ✗ CocoaPods installed but not initialized.
        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 initialize CocoaPods, run:
        pod setup
      once to finalize CocoaPods' installation.
[✓] Android Studio (version 3.1)
[✓] IntelliJ IDEA Community Edition (version 2018.1)
[!] Connected devices
    ! No devices available

! Doctor found issues in 3 categories.
Process finished with exit code 0

After correcting the flutter path doctor gives me this warning.

/Users/niyazitoros/development/flutter/bin/flutter --no-color doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel beta, v0.2.3, on Mac OS X 10.13.4 17E199, locale tr-TR)
[!] Android toolchain - develop for Android devices (Android SDK 27.0.3)
    ! Some Android licenses not accepted.  To resolve this, run: flutter doctor --android-licenses
[!] iOS toolchain - develop for iOS devices (Xcode 9.3)
    ✗ Missing Xcode dependency: Python module "six".
      Install via 'pip install six' or 'sudo easy_install six'.
[✓] Android Studio (version 3.1)
[✓] IntelliJ IDEA Community Edition (version 2018.1)
[!] Connected devices
    ! No devices available

! Doctor found issues in 3 categories.
Process finished with exit code 0

Solution

to fix the android SDK licence error go on your terminal and type

flutter doctor --android-licenses

then

pip install six

if the error still persists run

flutter upgrade