# Constraint\_error : glib-object.adb : 138 access check failed
**URL:** https://forum.ada-lang.io/t/constraint-error-glib-object-adb-138-access-check-failed/1820
**Category:** General
**Tags:** ada, gnat, linux, alire
**Created:** [February 16, 2025, 11:36am UTC](https://forum.ada-lang.io/t/constraint-error-glib-object-adb-138-access-check-failed/1820 "2025-02-16T11:36:55Z")
**Posts on this page:** 8
**Page:** 1
### Author:  [@Dimitrilesdos](https://forum.ada-lang.io/u/Dimitrilesdos)
#### Post date: [February 16, 2025, 11:36am UTC](https://forum.ada-lang.io/t/constraint-error-glib-object-adb-138-access-check-failed/1820/1 "2025-02-16T11:36:55Z")
please someone has an idea on how i can to solve this problem??? here is my code.
main.adb
pragma Ada\_2022;
with ada.text\_io; use ada.text\_io;
with Gtk.Window; use Gtk.Window;
with Gtk.Main; use Gtk.Main;
with Gdk.Pixbuf; use Gdk.Pixbuf;
with Glib.Error; use Glib.Error;
procedure main is
Win : Gtk\_Window;
Pix, Pix2 : Gdk\_Pixbuf;
Erreur : Glib.Error.GError;
begin
Init;
Gtk\_New (Win);
Win.Fullscreen;
Gdk\_New\_From\_File (Pix, “Image.jpg”, Erreur);
Pix2 := Scale\_Simple (Pix, 0, 0); – line 22.
Set\_Icon (Win, Pix2);
Win.Show\_All;
Main;
end main;
when i run my code, it raise an exception :
raised CONSTRAINT\_ERROR : glib-object.adb:138 access check failed
[/home/dimitrilesdos/project/software/main/bin/main]
0x578d21 glib\_\_object\_\_get\_object.part.0 at ???
0x579b41 gdk\_\_pixbuf\_\_scale\_simple at ???
0x5691ff main at main.adb:22
0x56a682 Main at b\_\_main.adb:1093
[/lib/x86\_64-linux-gnu/libc.so.6]
0x7fc4ca060248
0x7fc4ca060303
[/home/dimitrilesdos/project/software/main/bin/main]
0x5690bf \_start at ???
0xfffffffffffffffe
---
### Author:  [@dmitry-kazakov](https://forum.ada-lang.io/u/dmitry-kazakov)
#### Post date: [February 16, 2025, 11:57am UTC](https://forum.ada-lang.io/t/constraint-error-glib-object-adb-138-access-check-failed/1820/2 "2025-02-16T11:57:14Z")
You should handle errors. Add this after Gdk\_New\_From\_File:
```ada
Gdk_New_From_File (Pix, "Image.jpg", Erreur);
if Erreur /= null then
Put_Line ("Gdk_New_From_File error: " & Get_Message (Erreur));
Error_Free (Erreur); -- Erreur must be freed
return;
end if;
```
---
### Author:  [@Dimitrilesdos](https://forum.ada-lang.io/u/Dimitrilesdos)
#### Post date: [February 16, 2025, 7:26pm UTC](https://forum.ada-lang.io/t/constraint-error-glib-object-adb-138-access-check-failed/1820/3 "2025-02-16T19:26:31Z")
okay but the error message tell me that : failed to open file “image.jpg” : no such file or directory.
However, I put the image file where my program is located. why it can’t to open the file???
---
### Author:  [@dmitry-kazakov](https://forum.ada-lang.io/u/dmitry-kazakov)
#### Post date: [February 16, 2025, 9:26pm UTC](https://forum.ada-lang.io/t/constraint-error-glib-object-adb-138-access-check-failed/1820/4 "2025-02-16T21:26:31Z")
Because there is no such file? “Image.jpg” /= “image.jpg” in many OSes.
BTW, when building a GTK application you can use embedded images instead of loading external files.
---
### Author:  [@Dimitrilesdos](https://forum.ada-lang.io/u/Dimitrilesdos)
#### Post date: [February 17, 2025, 9:14am UTC](https://forum.ada-lang.io/t/constraint-error-glib-object-adb-138-access-check-failed/1820/5 "2025-02-17T09:14:57Z")
the file exists, but the program cannot find it I think. but why it not find my file??? and how to do for that it find???
---
### Author:  [@dmitry-kazakov](https://forum.ada-lang.io/u/dmitry-kazakov)
#### Post date: [February 17, 2025, 9:24am UTC](https://forum.ada-lang.io/t/constraint-error-glib-object-adb-138-access-check-failed/1820/6 "2025-02-17T09:24:44Z")
Use Ada.Directories.Current\_Directory to check the working directory and Ada.Directories.Exists to check the file name.
---
### Author:  [@Dimitrilesdos](https://forum.ada-lang.io/u/Dimitrilesdos)
#### Post date: [February 17, 2025, 10:07am UTC](https://forum.ada-lang.io/t/constraint-error-glib-object-adb-138-access-check-failed/1820/7 "2025-02-17T10:07:04Z")
thanks for your help. I don’t think that it’s the only solution but it works.
> . . .
> bool : boolean;
>
> begin
> . …
> bool := Ada.Directories.exists (“image.jpg”);
> if bool = true then
> Gdk\_New\_From\_File (Pix,“image.jpg”, Erreur);
> Pix2 := Scale\_Simple (Pix, 0, 0);
> if Erreur /= null then
> Put\_Line ("Gdk\_New\_From\_File error: " & Get\_Message (Erreur));
> Error\_Free (Erreur); – Erreur must be freed
> return;
> end if;
> end if;
---
### Author:  [@dmitry-kazakov](https://forum.ada-lang.io/u/dmitry-kazakov)
#### Post date: [February 17, 2025, 10:44am UTC](https://forum.ada-lang.io/t/constraint-error-glib-object-adb-138-access-check-failed/1820/8 "2025-02-17T10:44:59Z")
I use embedded images, so setting the icon never fails. I also use Set\_Icon\_List with 16x16, 24x24, 32x32 icons. GTK selects the most appropriate one for each case from the list.
When you load an external image you should not use a lossy formats like jpg and scaling. Scaling works very poorly for small images.