Avoid bad request

Hello

I have a issue on GTmetrix. Its says:

” The following requests are returning 404/410 responses. Either fix the broken links, or remove the references to the non-existent resources”

https://ellenaskitchen.com/wp-content/uploads/dynamic_avia/image_url

I guess this was happend, when I selected to redirect the “custom error 404 page” to my welcome page. I thought I can redirect 404 error to my welcome page. I fix this already, so the welcome page ist not set as 404 error page anymore.

But GTmetrix shows me still the above error. How can I fix that ?

Thanks for your help

Kind regards
Roger