@Nullable
  private String validateProjectFilePath(@NotNull File file) {
    if (!file.exists()) {
      return "The selected file does not exist";
    }
    if (myBuildSystemCombo.getSelectedItem() == BuildSystem.CMAKE && !file.getName().equals("CMakeLists.txt")) {
      return "Invalid file name. Expected: CMakeLists.txt";
    }
    else if (myBuildSystemCombo.getSelectedItem() == BuildSystem.NDK_BUILD && !FileUtilRt.extensionEquals(file.getPath(), "mk")) {
      return "Invalid file extension. Expected: .mk";
    }
    return null;
  }