Issues with fresh install of Pimcore

HI All!
I have recently started learning Pimcore and somehow I am not even able to install it. So far it’s been a very frustrating experience. I have tried it on AWS dedicated servers m4.large. m5.xlarge and on both I continuously get this error ‘Server threw exception - could not perform action. Please reload the admin interface and try again.’. I have installed it over 10 times now and same issues. I have used the official documentation for it.

check the attached screenshot. I am unable to save anything (even unpublished). here is the documentation I used: https://pimcore.com/docs/5.x/Development_Documentation/Getting_Started/Installation.html ( Advanced Demo Package).

any suggestions, please?

Thanks
Faisal

Any information in the logs?

BR
Christian