Magento 2: Unable to write file into directory

After installing Magento 2.4.1 I am getting this error:

Exception #0 (DomainException): Unable to write file into directory /var/www/html/magento2/pub/media/catalog/product/cache/912eee9e4cfa9553368073a74de060ea/m/b. Access forbidden.

I have manually installed the sample data for 2.4.1 version and when clicking on the product detail page, this error appears.