Allowed memory size of 805306368 bytes exhausted (tried to allocate 20480 bytes) in GenericHeader.php line 54. Magento2.3

Question

I am using magento 2.3 on ubuntu 18 and everything was working properly before reinstallation.

I was installing ubuntu again so I have saved my project to be able to move it later to new operational system after installation is done. Magento application is working but now I am getting this error:

[php7:error] [pid 4358] PHP Fatal error: Allowed memory size of 805306368 bytes exhausted (tried to allocate 20480 bytes) in /vendor/zendframework/zend-http/src/Header/GenericHeader.php on line 54

When I go to logout or after placing order on checkout the blank screen appears and in error log this line is shown.

I have tried to increase memory limit to 5000M but it doesnt matter how much memory limit I increase it will show again. Tried to use phpinfo() to check if memory limit is increased and it is but error still appears.

Answer 1

Answer to my question:

Magento project with that problem above that I mentioned is because that project is copied to usb flash driver because ubuntu is being reinstalled and after new fresh ubuntu installation I have added that project back to same location but it didnt worked. Needed to install magento application again from remote repo.