It means that the declaration of the start_lvl
method in wp_bootstrap_navwalker
should match the declaration of the method in Walker_Nav_Menu
. It doesn’t.
function start_lvl( &$output, $depth ) {
VS.
function start_lvl( &$output, $depth = 0, $args = array() ) {
Make the arguments match exactly and you should be fine.
And you should probably not use the wp_
prefix as yours is not Core code.
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