Python-for-android не может установить SDK

Я новичок в kivy и python-for-android, я выполнил инструкции в здесь, но у меня возникла проблема с использованием python-for-android

когда я запускаю buildozer android release, вывод:

# Check configuration tokens
# Ensure build layout
# Check configuration tokens
# Preparing build
# Check requirements for android
# Install platform
# Apache ANT found at /home/kasra/.buildozer/android/platform/apache-ant-1.9.4
# Android SDK found at /home/kasra/.buildozer/android/platform/android-sdk-20
# Android NDK found at /home/kasra/.buildozer/android/platform/android-ndk-r9c
# Check application requirements
# Check garden requirements
# Compile platform
# Command failed: /usr/bin/python -m pythonforandroid.toolchain create --dist_name=app --bootstrap=sdl2 --requirements=kivy --arch armeabi-v7a --copy-libs --color=always --storage-dir=/home/kasra/Desktop/kivy/first_one :|/.buildozer/android/platform/build
# 
# Buildozer failed to execute the last command
# If the error is not obvious, please raise the log_level to 2
# and retry the latest command.
# In case of a bug report, please add a full log with log_level = 2

и когда я запускаю /usr/bin/python -m pythonforandroid.toolchain create --dist_name=app --bootstrap=sdl2 --requirements=kivy --arch armeabi-v7a --copy-libs --color=always --storage-dir=/home/kasra/Desktop/kivy/first_one :|/.buildozer/android/platform/build

я лицо:

[INFO]:    Will compile for the following archs: armeabi-v7a
[INFO]:    Found possible SDK dirs in buildozer dir: android-sdk-20
[INFO]:    Will attempt to use SDK at /home/kasra/.buildozer/android/platform/android-sdk-20
[WARNING]: This SDK lookup is intended for debug only, if you use python-for-android much you should probably maintain your own SDK download.
[INFO]:    Android API target was not set manually, using the default of 15
[INFO]:    Available Android APIs are (19)
[WARNING]: Requested API target 15 is not available, install it with the SDK android tool.
[WARNING]: Exiting.

может кто-нибудь помочь, пожалуйста? : /