Re: Can't launch Rosegarden

   Just some limited searching seems to indicate that the "gtk" widget 
style was dropped around Qt 5.7 or so.  Maybe you're running a newer 
version of Qt and you are requesting the gtk widgets?

https://bbs.archlinux.org/viewtopic.php?id=214147&p=2

   See post #36.

   All the trails are from 2016/2017, though.  Not sure they are 
relevant today.

Ted.

On 6/7/24 6:24 AM, chuck elliot wrote:
> Rosegarden won't run at the moment.
> 
> The problem seems to be something to do with "GtkWidget" (see below).
> 
> 24.06 built fine from git source.
> 
> I have recently upgraded to fedora 39 and this is probably the first 
> time I have tried to
> 
> run RG since. Same result on a similar/identical system.
> 
> 
> gtk3-3.24.41-1.fc39.x86_64
> 
> gtk4-4.12.5-1.fc39.x86_64
> 
> RG output:
> 
> (rosegarden:725222): GLib-GObject-CRITICAL **: 11:12:47.844: cannot 
> register existing type 'GtkWidget'
> 
> (rosegarden:725222): GLib-GObject-CRITICAL **: 11:12:47.844: cannot add 
> class private field to invalid type '<invalid>'
> 
> (rosegarden:725222): GLib-GObject-CRITICAL **: 11:12:47.844: cannot add 
> private field to invalid (non-instantiatable) type '<invalid>'
> 
> (rosegarden:725222): GLib-GObject-CRITICAL **: 11:12:47.844: 
> g_type_add_interface_static: assertion 'G_TYPE_IS_INSTANTIATABLE 
> (instance_type)' failed
> 
> (rosegarden:725222): GLib-GObject-CRITICAL **: 11:12:47.844: cannot 
> register existing type 'GtkBuildable'
> 
> (rosegarden:725222): GLib-GObject-CRITICAL **: 11:12:47.844: 
> g_type_interface_add_prerequisite: assertion 'G_TYPE_IS_INTERFACE 
> (interface_type)' failed
> 
> (rosegarden:725222): GLib-CRITICAL **: 11:12:47.844: g_once_init_leave: 
> assertion 'result != 0' failed
> 
> (rosegarden:725222): GLib-GObject-CRITICAL **: 11:12:47.844: 
> g_type_add_interface_static: assertion 'G_TYPE_IS_INSTANTIATABLE 
> (instance_type)' failed
> 
> (rosegarden:725222): Gtk-CRITICAL **: 11:12:47.859: 
> gtk_widget_get_style_context: assertion 'GTK_IS_WIDGET (widget)' failed
> 
> (rosegarden:725222): Gtk-CRITICAL **: 11:12:47.859: 
> gtk_style_context_lookup_color: assertion 'GTK_IS_STYLE_CONTEXT 
> (context)' failed
> 
> (rosegarden:725222): Gtk-CRITICAL **: 11:12:47.868: 
> gtk_style_context_get_background_color: assertion 'GTK_IS_STYLE_CONTEXT 
> (context)' failed
> qt.qpa.gtk: Property name "theme_unfocused_bg_color" not found.
>   Falling back to  QGtk3Interface::QGtkColorDefault::Background
> 
> (rosegarden:725222): GLib-GObject-CRITICAL **: 11:12:47.868: cannot 
> register existing type 'GtkWidget'
> 
> (rosegarden:725222): GLib-GObject-CRITICAL **: 11:12:47.868: cannot add 
> class private field to invalid type '<invalid>'
> 
> (rosegarden:725222): GLib-GObject-CRITICAL **: 11:12:47.868: cannot add 
> private field to invalid (non-instantiatable) type '<invalid>'
> 
> (rosegarden:725222): GLib-GObject-CRITICAL **: 11:12:47.868: 
> g_type_add_interface_static: assertion 'G_TYPE_IS_INSTANTIATABLE 
> (instance_type)' failed
> -DCMAKE_BUILD_TYPE=Debug-DCMAKE_BUILD_TYPE=Debug-DCMAKE_BUILD_TYPE=Debugqt.qpa.events.reader: [heap]  0
> 
> 
> 
> 
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