Cannot install with npm

[mustfullDev]

when i run "npm install react-native-app-intro --save" it give me followed errors :

npm ERR! code 128
npm ERR! Command failed: C:\Program Files\Git\mingw64\bin\git.EXE submodule update -q --init --recursive
npm ERR! fatal: 'submodule' appears to be a git command, but we were not
npm ERR! able to execute it. Maybe git-submodule is broken?
npm ERR!

npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\mustapha\AppData\Roaming\npm-cache_logs\2018-07-04T13_48_00_286Z-debug.log