CODE EXAMPLE FOR PHP

undefined method JeroenNotenLaravelAdminLteHelpersMenuItemHelper::isSearchBar()

# Step 1
In this files:
resources/views/vendor/adminlte/partials/navbar/menu-item.blade.php
resources/views/vendor/adminlte/partials/sidebar/menu-item.blade.php
Change 
@inject('menuItemHelper', JeroenNotenLaravelAdminLteHelpersMenuItemHelper)
To
@inject('menuItemHelper', 'JeroenNotenLaravelAdminLteHelpersNavbarItemHelper')


# Step 2
Change the method 'isSearchBar' to 'isSearch'