Unable to locate "adwaita" theme engine

While running KDE on Arch linux, on a number of occassions, I get to see the following error.

(java:20732): Gtk-WARNING **: Unable to locate theme engine in module_path: "adwaita"

[828:828:0708/183334:ERROR:browser_main_loop.cc(249)] GTK theme error: Unable to locate theme engine in module_path: "adwaita"

The mitigation of the issue is installation of gnome-themes-standard package.