Ionic CLI causes crash

When I type ionic serve --lab this message occurs:

[ERROR] Error occurred while loading plugins. CLI functionality may be limited.
        Checking for CLI updates now...

After doing ionic --verbose:

[ERROR] Error occurred while loading plugins. CLI functionality may be limited.
        Checking for CLI updates now...
[DEBUG] Plugin error: Dependency missing for @ionic/cli-plugin-ionic1:

          [ERROR]: Cannot find module 'C:\Users\mycompr\Desktop\pro\ionic-project\node_modules\@ionic\cli-plugin-ionic1'
[DEBUG] Checking for latest plugin version of ionic@latest.
"3.0.0"

[DEBUG] Latest version of ionic@latest is .
[DEBUG] !!! ERROR ENCOUNTERED !!!
SyntaxError: Unexpected end of JSON input
[DEBUG] SyntaxError: Unexpected end of JSON input
            at JSON.parse (<anonymous>)
            at C:\Users\mycomp\AppData\Roaming\npm\node_modules\ionic\node_modules\@ionic\cli-utils\dist\lib\plugins.js:212:36
            at Generator.next (<anonymous>)
            at fulfilled (C:\Users\mycomp\AppData\Roaming\npm\node_modules\ionic\node_modules\@ionic\cli-utils\dist\lib\plugins.js:4:58)

I want to uses Ionic 1, not Ionic 2, so I've tried downgrading:

npm i ionic@1.3.3 according to their docs this is the last Ionic 1 version: http://ionicframework.com/docs/v1/overview/#download but I can't downgrade, in the npm I receive a 404 message.

What should I do? I'm trying to make a AngularJS - Ionic 1 project.

Thanks.

via tholo