Could you, please, explain your actions step by step to reproduce the mentioned error?
Do you plan to use Header and Footer for Elementor plugin to create Header/Footer instead of the built-in theme options for this?
Did you watch video tutorial on how to create Header https://www.youtube.com/playlist?list=PLMqMSqDgPNmDu3kYqh-SAsfUqutW3ohlG and edit footer https://youtu.be/gY-x4m47Duo but use Elementor instead of WPBakery page builder.
