npm WARN package.json webappgrunt@0.0.0 No repository field.

[Frédéric Delorme]

Hello,
While I am trying to use the fantastic Yo + Angular + Spark generator, I am facing a strange issue:

npm WARN package.json webappgrunt@0.0.0 No repository field.
generator-angular-spark@0.1.2 /usr/local/lib/node_modules/generator-angular-spark
├── pluralize@0.0.12
├── URIjs@1.11.2
├── underscore.string@2.3.3
├── lodash@2.4.1
├── asciify@1.3.5 (pad@0.0.4, chalk@0.3.0, optimist@0.6.1)
└── yeoman-generator@0.14.2 (dargs@0.1.0, debug@0.7.4, diff@1.0.8, 
rimraf@2.2.8, text-table@0.2.0, chalk@0.3.0, mime@1.2.11, 
async@0.2.10, mkdirp@0.3.5, isbinaryfile@0.1.9, 
shelljs@0.2.6, glob@3.2.11, iconv-lite@0.2.11, lodash@2.2.1, 
findup-sync@0.1.3, file-utils@0.1.5, request@2.27.0, 
cheerio@0.12.4, inquirer@0.3.5, download@0.1.19)

I don't know how to solve this ? Any idea/ help ?