config file missing/unable to configure picom

[ANP-Oxy]

I'm running PopOS 22.04. I'm using picom for configuring my suckless setup of dwm dmenu and st.

I installed Picom using apt. Then when I looked for the config file in /etc/xdg/ there was no picom.conf file there.

I downloaded the picom.sample.conf from the github repo and put it in .config.
as soon as I do that the picom just breaks. and throws this error
[ 05/26/2024 00:10:03.411 c2_parse_target ERROR ] Pattern "_GTK_FRAME_EXTENTS@" pos 19: Target type cannot be determined.

Without config file picom works fine but if I try to put a config file it starts throwing this error.

If I remove the config file and just do picom -b it starts working again. although it does show few messages like

MESA: error: ZINK: failed to choose pdev
glx: failed to create drisw screen

Also im not sure if this is relevant but I patched dwm with a patch called clientopacity and changed opacity in dwm config but nothing happened. But when I installed picom the the opacity that I set in dwm config automatically started working. So i don't really know how that works.