Hi Konstantinos,
I hope that you have installed cordova version 5.2
- Make sure you have executed the below commands after installing/upgrading SMP SDK.
- cd C:\SAP\MobileSDK3\KapselSDK\cli
- npm install -g
Also, double check you have required android platforms installed as mentioned in the guide: SAP Web IDE Hybrid App Toolkit Add-on
For your reference I am attaching my android SDK screenshot.
Regards, Midhun
SAP Technology RIG