warning : (/build/buildd/cairo-dock-3.4.1/src/implementations/cairo-dock-X-manager.c:_make_new_actor:144)

I ran cairo-docks -o in terminal. Below Warnings appeared and asked me to report.

  warning : (/build/buildd/cairo-dock-3.4.1/src/implementations/cairo-dock-X-manager.c:_make_new_actor:144)
  this window ((null), 88080384) doesn't belong to any class, skip it.
Please report this bug to the application's devs.
** Message: PRIME: No offloading required. Abort
** Message: PRIME: is it supported? no

(nautilus:16711): GLib-GIO-CRITICAL **: g_dbus_interface_skeleton_unexport: assertion 'interface_->priv->connections != NULL' failed

(nautilus:16711): GLib-GIO-CRITICAL **: g_dbus_interface_skeleton_unexport: assertion 'interface_->priv->connections != NULL' failed

(nautilus:16711): Gtk-CRITICAL **: gtk_icon_theme_get_for_screen: assertion 'GDK_IS_SCREEN (screen)' failed

(nautilus:16711): GLib-GObject-WARNING **: invalid (NULL) pointer instance

(nautilus:16711): GLib-GObject-CRITICAL **: g_signal_connect_object: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed
cairo_dock_create_surface_from_image_simple: assertion 'cImageFile != NULL' failed
Couldn't create plugins dir