Error with "bower install"

When I try to do bower install I get the following:

This is my .bowerrc

{
    "directory": "wwwroot/lib",
    "proxy": "http://<myproxy>:<port>",
    "https-proxy": "http://<myproxy>:<port>",
    "strict-ssl": false
}

Does anyone know why it could be and how could I fix it?