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I just upgrade my Magento 2.2.5 to 2.3.3 , and After running bin/magento setup:upgrade i got the following error:
Warning: Illegal string offset 'max_items' in vendor/magento/framework/App/Config/Scope/Converter.php on line 41
You should delete all the config which are related to the module Weltpixel in the db table core_config_data
Required, but never shown