grunt: not found on raspberry pi 2

[PSzczepanski1996]

npm WARN deprecated lodash.assign@4.2.0: This package is deprecated. Use Object.assign.

pogomap@0.1.0 postinstall /home/pi/Compilations/PokemonGo-Map-3.2.0 grunt build

sh: 1: grunt: not found

npm ERR! Linux 4.4.13-v7+ npm ERR! argv "/usr/bin/nodejs" "/usr/bin/npm" "install" npm ERR! node v6.7.0 npm ERR! npm v3.10.3 npm ERR! file sh npm ERR! code ELIFECYCLE npm ERR! errno ENOENT npm ERR! syscall spawn npm ERR! pogomap@0.1.0 postinstall: grunt build npm ERR! spawn ENOENT npm ERR! npm ERR! Failed at the pogomap@0.1.0 postinstall script 'grunt build'. npm ERR! Make sure you have the latest version of node.js and npm installed. npm ERR! If you do, this is most likely a problem with the pogomap package, npm ERR! not with npm itself. npm ERR! Tell the author that this fails on your system: npm ERR! grunt build npm ERR! You can get information on how to open an issue for this project with: npm ERR! npm bugs pogomap npm ERR! Or if that isn't available, you can get their info via: npm ERR! npm owner ls pogomap npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request: npm ERR! /home/pi/Compilations/PokemonGo-Map-3.2.0/npm-debug.log

[imadummy1]

so whats the problem? go find it? or do you need a scanner for that too?