Import Picasso library issues

Question

I'm trying to show images using Picasso library but I'm encountering some problems. I added this

dependencies {
compile 'com.android.support:appcompat-v7:+'
compile 'com.squareup.picasso:picasso:2.1.1'
}

in the build.gradle but I have a problem and I'm stuck. Could you help me please?

Sorry for the dummy question but there's always the first time ;)

Answer 1

Try pressing the "Sync Project with Gradle Files" button at the top.