Compile not working

Installed the latest Pearl theme on Magento 2.4.1 and the frontend is broken. Each time I compile, I receive the following error:

  Warning: Declaration of WeltPixel\LayeredNavigation\Model\Layer\Filter\Price::_renderRangeLabel($fromPrice, $toPrice) should be compatible with  

   Magento\CatalogSearch\Model\Layer\Filter\Price::_renderRangeLabel($fromPrice, $toPrice, $isLast = false) in /home/noblegra/staging.noblegrape.  

  co.uk/app/code/WeltPixel/LayeredNavigation/Model/Layer/Filter/Price.php on line 251