The plugin generated 7813 characters of unexpected output

[thadallender]

What I did
I installed Sell Media from the Plugins -> Add New page directly from WordPress.org

What I saw
The plugin generated 7813 characters of unexpected output....

I was shown lots of warning messages, like the following:

Deprecated: Return type of Recursive_ArrayAccess::offsetExists($offset) should either be compatible with ArrayAccess::offsetExists(mixed $offset): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /Users/thad/Sites/wordpress/wp-content/plugins/sell-media/inc/libraries/wp-session/class-recursive-arrayaccess.php on line 84

Deprecated: Return type of Recursive_ArrayAccess::offsetGet($offset) should either be compatible with ArrayAccess::offsetGet(mixed $offset): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /Users/thad/Sites/wordpress/wp-content/plugins/sell-media/inc/libraries/wp-session/class-recursive-arrayaccess.php on line 97

Deprecated: Return type of Recursive_ArrayAccess::offsetSet($offset, $data) should either be compatible with ArrayAccess::offsetSet(mixed $offset, mixed $value): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /Users/thad/Sites/wordpress/wp-content/plugins/sell-media/inc/libraries/wp-session/class-recursive-arrayaccess.php on line 111

What I expected
The plugin should activate without any errors.

See screenshots below.

[maharzan]

I think this is related to PHP 8.0 or newer versions. The master branch has the more latest version than .org version so can you check if this still happens on that version?