After running the application from the terminal, on exit it issues an error message.

[chavellas]

After running the application from the terminal e.g. gedit myfile +12, on exit it issues the following error message:
(gedit:12035): Gtk-WARNING **: 09:47:06.893: Theme parsing error: gtk-main.css:73:38: Failed to import: Error opening file /usr/share/themes/Radiance/gtk-3.20/apps/gnome-builder.css: No such file or directory

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gedit 3.28.1-1ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Tue May 15 09:55:53 2018
InstallationDate: Installed on 2018-03-05 (70 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20180105.1)
SourcePackage: gedit
UpgradeStatus: Upgraded to bionic on 2018-04-26 (18 days ago)

[apostol (faliagas)]

See https://bugs.launchpad.net/ubuntu/+source/ubuntu-themes/+bug/1773045

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[herculano souza (herculano-sou)]

this afect me, and this bother me a lot