Groovy Imports at INTELIJ

I am using INTELIJ and for these import :

import org.codehaus.groovy.control.customizers.ImportCustomizer;

import org.controlsfx.control.action.Action;

import org.controlsfx.dialog.Dialogs;

import org.fxmisc.richtext.CodeArea;

import org.fxmisc.richtext.StyleSpansBuilder;

import org.reactfx.Change;

import org.reactfx.EventStream;

import org.reactfx.EventStreams;

it's mentionned "Cannot Resolve Symbol"

WHAT SHOULD I DO ???