errors on start

[99zs]

All like in instruction :)
Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in D:...\root\test82a3\src\nova-base\core\Site.php on line 23

Deprecated: rtrim(): Passing null to parameter #1 ($string) of type string is deprecated in D:...\root\test82a3\src\nova-base\core\Router.php on line 47

1. folder directory -> "test82a3"
2. inside only your scripts -> 2 folders: src & docs
3. pictures are inside folder "src/galeries"
4. index.php -> "src/index.php"

Would there be a chance to change the script configuration? it would be nicer to post photos this way. And "Artist - Album" like "Author - Book title"

main folder (test82a3)
A / (artist name) / Artist - Album / (songs)
B / (artist name) / Artist - Album/ (songs)
C / ect.
....
Z

.htaccess
index.php
src/docs
src/nova-base
src/nova-config
src/nova-languages
src/nova-themes