Error npm serve (code ELIFECYCLE)

[webheberge]

I am run ionic serve show this error:

[bilow]

Try to install ionic-app-scripts and then retry.

npm install @ionic/app-scripts@latest --save-dev

[webheberge]

i get this error:

[bilow]

can you provide the result of the:
ionic info

And I assume you already did install ALL packages?
npm install

[webheberge]

@bilow

the result of the:
ionic info