Build errors on Ubuntu 23.04

[ghost]

../src/ui/window.vala:127.45-129.31: error: Access to non-public constructor `Gtk.AlertDialog.new' denied
  127 |             Gtk.AlertDialog cancel_dialog = new Gtk.AlertDialog (
      |                                             ^~~~~~~~~~~~~~~~~~~~~
  128 |                     """Your file isn't saved!
      | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  129 | Do you really want to quit?""");
      | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
../src/ui/window.vala:275.45-277.44: error: Access to non-public constructor `Gtk.AlertDialog.new' denied
  275 |             Gtk.AlertDialog cancel_dialog = new Gtk.AlertDialog (
      |                                             ^~~~~~~~~~~~~~~~~~~~~
  276 |                 """Your file isn't saved!
      | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  277 | Do you really want to create a new file?""");
      | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
../src/ui/window.vala:334.45-335.77: error: Access to non-public constructor `Gtk.AlertDialog.new' denied
  334 |             Gtk.AlertDialog cancel_dialog = new Gtk.AlertDialog (
      |                                             ^~~~~~~~~~~~~~~~~~~~~
  335 |                 "Your file isn't saved!\nDo you really want to open a file?");
      | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
../src/ui/script_properties.vala:104.41-105.64: error: Access to non-public constructor `Gtk.AlertDialog.new' denied
  104 |         Gtk.AlertDialog cancel_dialog = new Gtk.AlertDialog (
      |                                         ^~~~~~~~~~~~~~~~~~~~~
  105 |                     "Do you really want to remove this script?");
      | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
Compilation failed: 4 error(s), 0 warning(s)
ninja: build stopped: subcommand failed.

[mibi88]

I also had this issue one time, but when I retried I didn't had this problem.

[ghost]

Okay. I'll check with the flatpak manifest later. Thanks.

[mibi88]

I have the same issue, I think it is due to the version of valac because I'm not having this problem with fedora 38 and the latest version of manjaro, but I'm not sure.