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I am currently using gnome-open to open all files for which I do not know the default program (or can't remember it at the time).

With file extension .pdf, gnome-open opens the file in my PDF document reader correctly, and then produces this message:

(evince:12416): Gtk-CRITICAL **: gtk_widget_show: assertion 'G TK_IS_WIDGET (widget)' failed

(evince:12416): Gtk-CRITICAL **: gtk_widget_show: assertion 'GTK_IS_WIDGET (widget)' failed

It's not a typo, it outputs the message twice. I do not know what a widget is, but clearly this particular widget fails to check out as one.

With file extensions .jpg, gnome-open opens the picture with the picture viewer, and then outputs this message:

(eog:12448): EOG-WARNING **: Failed to open file '/home/rhobot/.cache/thumbnails/normal/07915f2a54cfeb4b5f53aaa9c4988436.png': No such file or directory

I have a few questions:

1) Why does gnome-open work perfectly fine, yet simultaneously produce errors?

2) Why when opening a .jpg file, which exists in /home/rhobot/Pictures does gnome-open attempt to open a .png file that exists in a hidden directory?

3) Most importantly - what do these error messages mean, and how can I fix my system so these errors do not occur?

Even though my files open, and the programs that they open with work just fine, I do not like the idea of my system not running as perfectly as it can. Please help me to diagnose and fix these problems. I am new to Ubuntu, please assume that I know nothing if answering.

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What I did as a poor workaround is that I created, in my .bashrc aliases for each command using GTK+ I start from the shell. For instance the following line for evince

alias evince="evince 2>/dev/null"

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