Hi Yamini,
When you import the project to Android SDK, you should not get any error. You have to import the project to Android SDK only when you need to create an apk file to distribute it to users.
While importing the project do not check the option "copy projects into workspace". Also change the Open Perspective to Java, I could see that it's in Java EE now.
You could also test the app from command window. Use the commands cordova emulate android or cordova run android, the latter is for running the app on devices which are connected to the your machine.
This is not related to the Kapsel plugins, these are related to Cordova.
Regards,Midhun
SAP Technology RIG