Ionic facebook connect error while building

Some more information please. I have no idea what you are talking about.

i have installed Facebook plugin using :

  $ ionic cordova plugin add cordova-plugin-facebook4 --variable APP_ID="123456789" --variable   
  $ npm install --save @ionic-native/facebook

but i 'm having problems while building the app using eclipse

What problems are you having?

i uploaded the image , the problem is with the , am i missing a library ?

The images contains a list of packages and (probably) an opened file with some squiggly lines under the package names. That is not an error message or problem we could debug.

How are you building and what exactly is happening?

That is, again, a screenshot that doesn’t tell me anything. I want the Ionic CLI command and error message you get when building. Best also post your ionic info output.