Error while installing Brave via apt on Ubuntu 22.04

Disclaimer: I am very new to Linux I installed Brave via snap, but every time I launch it, it keeps asking me to make it the default browser when I already have done so. Because of that, I opted to try and install it via apt using the method given in this website:

However, upon trying to do so, I keep getting this error message in the terminal:

Invalid value set for option Signed-By regarding source stable (not a fingerprint) E: The list of sources could not be read.

This also occurs when trying to install any other application via apt. Does anyone know why this happens, and does anyone have a solution? Thanks.

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