I tried to build app inventor on windows But failed

I read all docs but failed to build. Reports are I faced error.


Please help me to build

Your error indicates that you didn't read all the documentation. The error in question occurs if you don't run

git submodule update --init

before your first build. This is noted in the README file.

This guide is helpful to you
http://josmas.github.io/contributingToAppInventor2/#/

How to collect all files and pack like app inventor offline