Its difficult for me to add cordova plugins to my ionic apps

I need help, its been difficult for me to add cordova plugins to my ionic apps, my version of ionic is V 1.7.14
error message
Error:Registry returned 404 for GET on http://registry.npmjs.org/com.ionic.keyboard

i have checked my package.json file i have this "cordovaPlugins": [ "cordova-plugin-device", "cordova-plugin-console", "cordova-plugin-whitelist", "cordova-plugin-splashscreen", "cordova-plugin-statusbar", "ionic-plugin-keyboard" ],
list of plugins
but when i run “cordova plugin list”, i get "no plugin is added. "
i have installed cordova 3days ago, so i guess its the latest version.

please , what am i doing wrong?

how do i resolve this please.

Just to be clear. the plugins were there, then they disappeared? Did you do any updates, or change machines?

try this command

ionic state reset

it will readd all platforms and previously installed plugins