Cannot find module "pouchdb" in RC4

I copied my src folder from my RC2 project (working) to a new RC4 one. Ionic serve tells me 'Cannot find module “pouchdb” ’ ?
What did I miss?

Ionic Framework: 2.0.0-rc.4
Ionic Native: 2.2.11
Ionic App Scripts: 0.0.47
Angular Core: 2.2.1
Angular Compiler CLI: 2.2.1
Node: 6.8.0
OS Platform: Windows 10
Navigator Platform: Win32
User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36

What steps did you take exactly? What you have here is vague.
does your package.json have the same entries?
if so try removing the node_modules folder and then npm install
re-add your plugins and then remove your platforms then re add them

I’m just taking a stab at this not knowing what steps you took.

The entries were the same.
I removed the node_modules folder, npm install and it worked !