Change it to protected in (Note the path)
/home/*server*/*store-name*/controllers/front/listing/ManufacturerController.php
OR
Change it to private in
/home/*server*/*store-name*/override/controllers/front/listing/ManufacturerController.php
In both the files, Access level must be the same. Some module has overridden the ManufacturerController & made the $label as protected while in the core file, Its private
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