you are using incorrect git clone URLs. try this in your smart.json
{
"packages": {
"scss": {},
"iron-router": {},
"normalize.css": {
"git": "https://github.com/rithis-archive/meteor-normalize.css.git"
},
"Meteor.cron": {
"git": "https://github.com/alexsuslov/Meteor.cron.git"
}
}