@NotNull
  @Override
  public Set<String> getExistingProjectLibraryNames() {
    if (myProjectLibrariesNames == null) {
      myProjectLibrariesNames = new HashSet<>();
      LibrariesContainer container = LibrariesContainerFactory.createContainer(myContext, myModulesProvider);
      for (Library library : container.getLibraries(LibrariesContainer.LibraryLevel.PROJECT)) {
        myProjectLibrariesNames.add(library.getName());
      }
    }
    return myProjectLibrariesNames;
  }
@NotNull
  @Override
  public Set<String> getExistingProjectLibraryNames()