Logo issue and SP Page Builder not opening

Hello,
I just upgraded my site (under Joomla 3.10.11) to PHP 8.0 and I updated the Melvin template and Sp Page Builder and since then I have encountered 2 problems:
Then, I wanted to change the logo because it had reduced following the update and 1/ the logo is displayed reduced, so I tried to change it via the template but when I click on the Select button, I arrives on a blank page at the level of the media.
2/ When I go to the SP Page Builder component and want to open a page, I get a 500 error and nothing is displayed.
Thanks for your help.