Failed to create virtual machine.Which version about android sdk?

[zwj2017-NK]

Starting emulator...
Waiting for the device: ........................................................ failed
Failed to boot the emualtor. Exiting...
Error: Missing platform-tools
Deleting file /home/zhuwenjun/.android/avd/maline-avd.ini
Deleting folder /home/zhuwenjun/.android/avd/maline-avd.avd

[mdimjasevic]

@zwj2017-NK , as stated in the documentation, we tested maline against Android 4.4.3 (API version 19). If you would like to reproduce this, you can find instructions for building the particular used SDK in docs/building-android.org.

[zwj2017-NK]

Thanks a lot. Firstly, I ran "vagrant up" command in the root of this project, all is well. Secondly, I have downloaded the custom SDK into my home directory, and set some environment variables. Thirdly, Creating virtual machine by running "avd-create.sh -a x86 -d maline-avd". I am very confused about the following error:
zwj@zwj-Vostro-3668:~/projects/maline$ avd-create.sh -a x86 -d maline-avd
Starting emulator...
Waiting for the device: ........................................................ failed
Failed to boot the emualtor. Exiting...
Error: Missing platform-tools
Deleting file /home/zwj/.android/avd/maline-avd.ini
Deleting folder /home/zwj/.android/avd/maline-avd.avd

AVD 'maline-avd' deleted.

[mdimjasevic]

Your PATH variable is not set right. Try following the readme from the beginning.

[zwj2017-NK]

zhuwenjun@zhuwenjun-Vostro-3668:/projects/maline$ echo $ANDROID_HOME
/projects/custom-android-sdk
zhuwenjun@zhuwenjun-Vostro-3668:/projects/maline$ echo $MALINE
/home/zhuwenjun/projects/maline
zhuwenjun@zhuwenjun-Vostro-3668:/projects/maline$ echo $PATH
/home/zhuwenjun/projects/maline/bin:/home/zhuwenjun/projects/custom-android-sdk/tools:/home/zhuwenjun/projects/custom-android-sdk/platform-tools:/usr/lib/scala/scala-2.11.8/bin:/usr/lib/jvm/java-1.8.0-openjdk-amd64/bin:/projects/maline/bin:/projects/custom-android-sdk/tools:/projects/custom-android-sdk/platform-tools:/home/zhuwenjun/anaconda2/bin:/usr/lib/scala/scala-2.11.8/bin:/usr/lib/jvm/java-1.8.0-openjdk-amd64/bin:/projects/maline/bin:/projects/custom-android-sdk/tools:/projects/custom-android-sdk/platform-tools:/home/zhuwenjun/anaconda2/bin:/home/zhuwenjun/gopath/bin:/usr/local/go/bin:/home/zhuwenjun/Downloads/spark/spark-2.3.1-bin-hadoop2.7/bin:/usr/lib/jvm/java-1.8.0-openjdk-amd64/bin:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/bin:/usr/lib/scala/scala-2.11.8/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/usr/local/hadoop/bin:/usr/local/hadoop/sbin:/snap/bin:/home/zhuwenjun/Downloads/spark/spark-2.3.1-bin-hadoop2.7/bin:/home/zhuwenjun/Downloads/spark/spark-2.3.1-bin-hadoop2.7/bin:/usr/local/hive/bin:/usr/local/hadoop$:/projects/custom-android-sdk/tools/:/projects/custom-android-sdk/platform-tools/:/projects/custom-android-sdk/build-tools
zhuwenjun@zhuwenjun-Vostro-3668:/projects/maline$
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
These are the information about my environment variables.

[mdimjasevic]

Sorry, I don't know how to help any further as you seem to have platform-tools in your path.

[zwj2017-NK]

Thanks again. I want to know the version number of custom-android-sdk, because I suspect that the platform-tool directory lacks essential files.

[zwj2017-NK]

I ran 'android update sdk -u' in the directory of '/projects/custom-android-sdk/tools/'. Then, creating virtual machine by running 'avd-create.sh -a x86 -d maline-avd', but it was failed.
zhuwenjun@zhuwenjun-Vostro-3668:/projects/maline$ avd-create.sh -a x86 -d maline-avd
Starting emulator...
Waiting for the device: ......................................................... failed
Failed to boot the emualtor. Exiting...
Deleting file /home/zhuwenjun/.android/avd/maline-avd.ini
Deleting folder /home/zhuwenjun/.android/avd/maline-avd.avd
AVD 'maline-avd' deleted.