Call to undefined method JeroenNotenLaravelAdminLteHelpersMenuItemHelper::isSearchBar(
the metod is deprecated, you have to replace "isSearchBar" with "isLegacySearch" in this files:
#resources/views/vendor/adminlte/partials/navbar/menu-item.blade.php
#resources/views/vendor/adminlte/partials/sidebar/menu-item.blade.php