Raspberry Pi 4 Duplicate src Declaration

First time OpenWrt user here, so forgive me if the answer seems super simple.

I'm trying to set up my Raspberry Pi 4 as router with OpenWrt. I have the snapshot flashed and I've been trying to set up LuCI because I would rather work with a GUI than a terminal. I keep running into the same error whenever I try to install a new package though. No matter the package, I get
* opkg_conf_parse_file: Duplicate src declaration (openwrt_kmods https://downloads.openwrt.org/snapshots/targets/bcm27xx/bcm2711/kmods/5.4.73-1-b5126fb12c29ea3221287a66d17449ed). Skipping
Trying to install LuCI or nano or Nginx always gives this error and then it seems to not work. I can't get the GUI to load up (not sure how I'd launch it tbh, I assume by enabling it but it always says it isn't found) nor can I enable the other packages.

Opkg update not continuing for TP-Link Archer A6

Better use this one.

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