Notice: Undefined index: in /home/tbnet/public_html/m2.3/vendor/magento/module-developer/Model/View/Page/Config/RendererFactory.php on line 70

how to solve this error? cannot access m2.3.4 backend

  • did you run all commands like upgrade, compile etc? – Abdul Samad Abbasi Dec 17 '20 at 4:17

I recommend you check your core_config_data table.

If there is a path with value = dev/front_end_development_workflow/type, delete it.

Hope it helps!

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